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If three successive coefficients in the expansion of (1+x)n are 210,120 and 45 respectively, find n.
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10
Look at a table of binomial coefficients
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102,105,111,114,120,123,129,_,_,_,_,_, 201,204,210,213,219
in the binomial expansion of (1+x/k)^n, where k is a constant and n is a positive integer, the coefficients of x and x^2 are