1.

If (1 + x) (1 + x + x^(2)) (1 + x + x^(2) + x^(3))...(1 + x + x^(2) + . . . + x^(n)) = a_(0) + a_(1)x + a_(2)x_(2) + ... +a_(m)x^(m), then value of a_(1) is

Answer»

m+1
n+1
n
m

Answer :C


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