Questions
In the expansion of the coefficient of and are and respectively, then
a
n=3, p=2
b
n=4, p=2
c
n=4, p=3
d
n=5, p=3
detailed solution
Correct option is B
We have (1+px)n=1+nC1(px)+nC2(px)2+…=1+npx+12n(n−1)p2x2+…According to the hypothesis, np=8 and 12n(n−1)p2=24Putting p=8/n in the second expression, we get12n(n−1)8n2=24⇒n−1n=24×28×8=34⇒4n−4=3n⇒n=4Putting this value in np=8, we get p=2.Talk to our academic expert!
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The coefficient of x4 in the expansion of is
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