Pnc doubt

Here i first picked 1 question from each section in 4C1 ways and then picked 2 questions from all the remaining questions

4C1x4C1x4C1x9C2=2304. But the correct ans given is 624. In that they did 12C5-3C2x8C5. I understood their method. But why is my method wrong?

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Thanks, this clears up the doubt.

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Hey, can anyone explain the concept of Exponent of Prime p in n! ??
@Gauri @Gaurav_Singh maybe??

I can’t quite understand the logic…

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I only know that formula , derivation was not taught to us .

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