Q.
Coefficient of x17 in the polynomial P(x)=∏r=017 (x+35Cr) is
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a
234
b
36C17
c
235−36C17
d
0
answer is A.
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Detailed Solution
P(x) is a polynomial of degree 18, and coefficient of x17 is N=35C0+35C1+35C2+…+35C17 (1)Using nCr=nCn−r, we can write N as N=35C35+35C34+…+35C18 (2)Adding (1) and (2), we get 2N=35C0+35C1+…+35C35=235⇒ N=234
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