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Square in Pascal's triangle (Posted on 2016-02-03) Difficulty: 3 of 5
Prove that:
If p is a prime number greater than 3 and k = ⌊2p/3⌋,
the sum C(p,1)+C(p,2)+C(p,3)+C(p,4)+...C(p,k)
of k binomial coefficients is divisible by p^2.

No Solution Yet Submitted by Ady TZIDON    
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