Questions
The coefficient of x4 in the expansion of is
detailed solution
Correct option is D
1+x+x2+x3n=(1+x)n1+x2n =1+nC1x+nC2x2+…+nCnxn1+nC1x2+nC2x4+…+nCnx2n .Therefore, the coefficient of x4=nC2+nC2nC1+nC4=nC4+nC2+nC1nC2Talk to our academic expert!
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If the third term in the binomial expansion of equals 2560, then a possible value of x is
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