Permutations and Combinations - Forming Numbers (Part 1) | Don't Memorise | GMAT/CAT/Bank PO/SSC CGL

[@InfinityLearn_NEET]

#DMTips: To summarise, “Permutation is an ordered Combination”. To learn more about Permutations and Combinations, enroll in our full course now: infinitylearn.com/cbse-fullcourse?KZbinDME&XPPYYM6WCuE&Comment To watch more videos on Permutations and Combinations, click here - bit.ly/PermutationsCombinationsVideos_DMYT

[@ahinsawijerathne2871]

How many 3 digits number can be formed the digits 2,3,5,6,7 and 9 which are divisible by 5 and none of the digits is repeated. Can you tell me how to solve that type of question?

[@AchiragChiragg]

@@ahinsawijerathne2871 there are 6 numbers. 2,3,5,6,7,9. If a number is divisible by 5 the last digit should be either a 0 or 5. We don't have a zero in the given number list. Fix the last digit as 5. Now we have 6-1=5 numbers (since we fixed one number(5) as last digit) __ __ 5 The other two positions can be filled by 5P2 ways. 5P2 is 20.

[@AchiragChiragg]

5P2 is nothing but 5x4.

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Tank

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[@InfinityLearn_NEET]

Thank you very much for the appreciation and for watching Subir. :)

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[@InfinityLearn_NEET]

Glad you liked it! Please subscribe to our channel: bit.ly/DontMemoriseKZbin Happy Learning :)

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[@InfinityLearn_NEET]

You're welcome Amelie! For more awesome videos, do register on our website DontMemorise.com Happy Learning :)

[@silverfox16466]

May I trouble you for a moment? In a different channel, they said the answer to this question is 6: David has three shirts and two sweaters. How many ways can he wear either a shirt or a sweater? It has me confused. :( Am I missing something?

[@InfinityLearn_NEET]

Hi Amelie! Apologies for the late response. If David has 3 shirts and 2 sweaters, there are only 5 ways in which he can pick any of those! The answer should be '3+2' = 5 #DontMemorise

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I think if the question was, "in how many ways can David wear a shirt and a sweater?" then the answer would have been 3*2=6ways.... And would have been the key...

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[@InfinityLearn_NEET]

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[@InfinityLearn_NEET]

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[@InfinityLearn_NEET]

Thank you so much Bandana for your appreciation. We are glad that you understood the concept. For more videos, please visit our website - dontmemorise.com/