Interesting Permutations Question: Summing 3-Digit Numbers

[@MukulKumar-ir6uk]

Truely sir respect for you sir

[@pranjalverma3501]

THANKS SIR.Very informative video.

[@anujsharma2209]

Gail has a collection of 10 cards with the numbers 1 to 10 printed on them. How many different three-digit numbers could be formed if she chose three cards that sum to 12?

[@mnayu]

ng 1. Let us find those that contain 2 and higher numbers. 12=2+3+7 12=2+4+6 Let us now find sums that contain 3 and higher numbers. 12=3+4+5. All other sums of three numbers can not total to 12. Each of the seven sets of cards can be rearranged 3! times. The result is then 7*3!=42.

[@lanierharold9729]

Is this for geometry???

[@adilsajjad3309]

Given the digits 1, 2 and 3, how many 3-digit numbers can you make such that no digit is repeated?

[@Leopol]

6, he listed them out in the video