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Question

How many coefficients in the binomial series expansion of (1+x)^7 are divisible by 7?
12 years ago

Answers

Reiny
From Pascal's triangle or from evaluating
C(7,0), C(7,1) ... we know the coefficients are

1 7 21 35 35 2 1 7 1 , so I count 6 of them
12 years ago

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