Questions
a
5
b
1/5
c
2/5
d
5/2
detailed solution
Correct option is C
Comparing the given series with 1+nx+n(n−1)1.2x2+.. We get nx=−18,n(n−1)1.2x2=1.38.16⇒nx(nx−x)=364⇒(−1/8)(−1/8−x)=3/64⇒1/8+x=3/8⇒x=3/8−1/8=2/8=1/4⇒nx=−1/8⇒n(1/4)=−1/8⇒n=−1/2 Given series =(1+x)n=(1+1/4)−1/2=(5/4)−1/2=(4/5)1/2=2/5.Talk to our academic expert!
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