Have you noticed that?

Math Olympiad
1

^nC_r= \frac{^nP_r}{r!}

^nC_2= \frac{n(n-1)}{2}

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2

That’s right and awesome

3

Thanks :+1: :+1::+1::+1::+1::+1::+1::+1::+1::+1::+1::+1:

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4

Welcome :slightly_smiling_face::slightly_smiling_face::slightly_smiling_face::slightly_smiling_face::slightly_smiling_face::slightly_smiling_face::slightly_smiling_face::slightly_smiling_face::slightly_smiling_face::slightly_smiling_face::slightly_smiling_face::slightly_smiling_face:

5

Okay :+1::+1::+1::+1::+1::+1::+1::+1::+1::+1::+1::+1::+1::+1::+1::+1::+1::+1:

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6

Bro, it is very easy fact of bionamal theorem :blush:

7

\fbox{Thanks}

:+1:t2::+1:t2::+1:t2::+1::+1:t2::+1::+1:t2::+1::+1:

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