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Question

If an+bnan1+bn1is the A.M. between a and b, then find the value of n.

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Solution

According to the given condition,
Given is the A.M between a and b, therefore,

a+b2=an+1+bn+1an+bn

a+b2=an×a+bn×ban+bn

Cross multiply.

an×a+an×b+bn×a+bn×b=2an×a+2bn×b

anb+bna=ana+bnb

anbana=bnbbna

an(ba)=bn(ba)

an=bn

a and b can only be equal if n=0. (xn=1)

Thus, n=0.

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