Grade 12 Algebra Lesson 6| Sequences and Series : Sigma Notation

[@pianoza15]

Thank you sir for this lesson I struggled with MATHEMATICS from 2014. Now I am ready to upgrade this May🙏🙏🙏🙏

[@MlungisiNkosi]

You are most welcome 🤗 ❤️

[@lisitenzikamusaro914]

Words are not enough to show my gratitude sir, you're simply amazing & you're the best teacher ever, may the lord continue to bless you❤🙌.

[@MlungisiNkosi]

Thank you so much 🤗

[@callumlawson-smith1618]

Thank you so much sir. My teacher explained this about 5 times but I still didn't understand. I have just found this channel and I understand the first time. You are my saving grace this year

[@MlungisiNkosi]

Thank you so much 🤗

[@CatherineMoruka-ll8bg]

Thank you,Thank you, Our dearest uncle for simplifying the sigma notation

[@MlungisiNkosi]

You are very welcome

[@BookOfTheSON]

THANK SO MUCH SIR YOU ARE ASSITING SO MUCH INTERMS OF MY GOAL OF GETTING A MATH DISTICTION THIS YEAR FOR MY FINAL NSC REPORT , NGIYABONGA

[@yvettemabena437]

its the 10th of december and finally im going to start watching your videos since i will be going to matric next month and yess i really have a great feeling☺

[@MlungisiNkosi]

Have fun! And I don’t doubt that you’ll do well

[@yvettemabena437]

@@MlungisiNkosi 🙏🙏🙏🙏🙏

[@ndilekakafile2520]

how is matric now? we're writing tomorrow

[@DoctorTholaphi]

Going to fetch my paper 1 distinction tomorrow ❤

[@NonkululekoZinhle-kw8lb]

Hi i don't under how upu got the 9 at Example 2 and aslo do you always ise T1 until to T3 if you looking for the terms

[@LindokuhleZondi-t7d]

I believe he made a mistake in e.g 2 because we got 10 term not 9

[@queenleerapper9867]

The terms are starting from 2 to 10 so which means the total number of the terms is equal to 9.

[@Linomta.Tabata]

How to find the terms you will say 10-2+1 which is ending value minus starting value plus one equal the terms we should utilise

[@AyathandwaK67]

there are nine terms. {2 3 4 5 6 7 8 9 10}

[@lilfourteenyeah8705]

Thank you soo much, I am writing tomorrow sir :)

[@MlungisiNkosi]

Thank you so much 🤗

[@dreamclub5292]

Hi. Thanks for the lesson My question is at 21:22 is n=1 because the first value was 1 or because we had T1?

[@zikhonandinisa1395]

Your God sent sir🥺🥺❤️❤️❤️❤️❤️so much love for you

[@MlungisiNkosi]

Thank you so so much

[@realedits677]

Really amazing teacher ❤️

[@MlungisiNkosi]

Thank you so much

[@SebenzileMthethwa-d6n]

Best teacher ❤

[@KhetheloMncibi-tm7dm]

At 16:18 why do we use 9 instead of 10 since the last term is 10

[@mzansigotdrip1480]

It's supposed to be 10-2=8 Since the counter starts at 2 and ends at 10 there are 8 numbers therefore n=8

[@matomemashapu763]

​@@mzansigotdrip1480the formula is top - bottom + 1 so it's going to be 10 - 2 + 1 therefore n = 9

[@halatimaxwell6998]

@@matomemashapu763 why didn't we do the same on the first example

[@Milani.Ndlazi]

Uni stats and you're still carrying me ❤❤

[@MlungisiNkosi]

It’s my pleasure 😇

[@kundaimaiwasha7391]

Good day Mr Nkosi😀 Question : When it comes to geometric sums will you be penalized for using the wrong formula in terms of whether r is greater or smaller than 1? Because on the one with the 255.5 one, I calculated it as if r was less than 1 but still got to the same answer. [Just for curiosity's sake and for future refferences ]

[@MlungisiNkosi]

Not at all… And that’s why they give you one formula anyway

[@kundaimaiwasha7391]

Okay, Enkosi🙂

[@risimachabalala9895]

wena youre the best mathematics teacher mfe2 salute to you Im from limpopo hala ka va Zing zong na zeng😁

[@alisonvanwyk8986]

Appreciate this. 🥺

[@MlungisiNkosi]

You're welcome 😊

[@gracemaria1696]

Sir as I was practicing sequence and series I found a sequence which head both arithmetic and geometric series so I then found it to do question I was asking if you can do one more of this

[@MlungisiNkosi]

I know exactly what you’re talking about. I will do it at a later stage

[@nonkululekosuddenmaebela3726]

You are the best 👍🏽👍🏽🙏

[@MlungisiNkosi]

I appreciate that! Thank you

[@atli_m25]

Thank you I needed this 🙏🏾

[@MlungisiNkosi]

My pleasure

[@ntshemborikhotso9707]

Thank you so much Sir...God bless

[@MlungisiNkosi]

You’re welcome ☺️

[@CatherineMoruka-ll8bg]

Good Afternoon How much is the lessons for the whole month

[@mildredagu8028]

Good day sir For the second last example you said it was 9 that we have 9 terms remaining...why isn't it 8 since 10-2=8

[@MlungisiNkosi]

Apologies

[@epiphanyfanatic1167]

It is supposed to be 9 because the formula to find the number of terms is the number on top - the number on the bottom + 1 which equals 9

[@mel_indaa.a]

Thank you 😭💖

[@MlungisiNkosi]

You’re welcome

[@JahsehXXX03]

is it important to calculate the number of terms like [number of terms = top number - bottom number + 1 ]

[@MlungisiNkosi]

Yes… especially if it serves a specific function in the questions. I’ll do past exam questions soon. Hopefully that will help clarify certain things

[@user9billion-x8i]

hello sir, 2023 matriculant here! i was just working your sum of geometric seq. and i had an answer of 128 but you had 255.5 , i have been trying but i still cant figure out where i went wrong

[@MlungisiNkosi]

I’ll see if I can assist…

[@KhomotsoXobile-sp5yk]

Try dealing with the upper part first then when you're done do the other part you will then get an answer of 255.5

[@mzansigotdrip1480]

You used 8 as n which is also correct

[@CatherineMoruka-ll8bg]

Uncle Mlu you didn't do exam paper for may/June 2022, unless if I have missed it

[@luc.b6951]

Very helpful concepts

[@MlungisiNkosi]

Thank you

[@Kauko_zeka]

Namibia University of science and technology student in the building

[@MlungisiNkosi]

🥳🥳🥳🥳🥳🥳🥳

[@dipe6376]

When are we tackling sequence and series exam questions sir?

[@MlungisiNkosi]

I will do so once I'm done with all the content and more towards the exams.

[@luc.b6951]

Nice videos keep it up 👍

[@MlungisiNkosi]

Thank you

[@nokukhanyadlanagalala6864]

Thank you sir❤️

[@MlungisiNkosi]

You’re welcome ☺️

[@blessingmaebela1006]

Good work Mr Nkosi.

[@MlungisiNkosi]

My pleasure

[@lulamalurh6112]

S9 IF I ROUND IT TO ONE DECIMAL PLACE WOULD I BE WRONG AND LET IT EQUAL TO 256? MINUTES 16.43

[@MlungisiNkosi]

It depends on the instruction of the examiner.

[@linkiemakalela7250]

Thanks very much sir.

[@AmahleSosibo-y5i]

Thanks

[@alibasira5051]

What about the aquatic ∆ series

[@MlungisiNkosi]

I’m not sure what you’re referring to…

[@m.aasego_n]

Thank you so much

[@zembii66]

Legend

[@MlungisiNkosi]

Thank you

[@Shaneee7]

class of 2025🎉🎉

[@banny_tee3743]

Sir i now this video is from 2 yrs ago but i need clarity From the second last example Uthi the counter starts from T2 and yet you used a- value to be 1\2 and it's not the first term but second I'm not sure if you'll understand what I mean 🙈🙈

[@banny_tee3743]

@Mlungisi Nkosi sir your the best you just got me thinking I got the reason why and it makes sense now thank you a lot I am upgrading. I am a class of 2018. Ever since I am watching your videos for understanding. And thank you God Bless You 😊🎉

[@MlungisiNkosi]

You’re welcome ☺️

[@luc.b6951]

Some of your explanations were confusing please work on it

[@MlungisiNkosi]

If you can, please let me know which ones…

[@samkelomagwazaGSMSOLUTION]

YOU TEACH IT VERY WELL SIR BUT IM CONFUSED WHILE YOU SUBTITUTED 9 INSTEAD OF 10 to (n) HELP

[@MlungisiNkosi]

Please provide time stamp so that I know which is part you’re referring to

[@amahlencobeni2145]

15:06

[@Dxviddddd]

Because the pattern started at n=2. That means it could not have been n=10 but instead n=9 (there were 9 terms(n) not 10) Formula for it is (number at top of sigma notation - number at bottom of sigma notation + 1)