Questions
Sum of the last 12 coefficients of in the binomial expansion of is:
a
222
b
223
c
223-23C11
d
223-211
detailed solution
Correct option is A
Sum of last 12 coefficients isS=23C12+23C13+…+23C23Using nCr=nCn−r we getS=23C11+23C10+…+23C0Adding (1) and (2), we get2S=23C0+23C1+…23C23=223⇒ S=222Talk to our academic expert!
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If the coefficients of P th, ( p + 1)th and (p + 2)th terms in the expansion of (1 + x)n are in AP, then
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