Questions
Suppose th term of a is and th term is then its th is
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a
pq
b
pqpm/n
c
pqpm/2n
d
pq
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Correct option is C
Let a be the first term and r be the common ratio.We have p=am+n=arm+n−1 q=am−n=arm−n−1⇒ pq=am+nam−n=r2n⇒r=pq1/2nNow, an=arn−1=arm+n−1rm=ppq−m/2n=pqpm/2nSimilar Questions
If the first term of an infinite G.P. is 1 and each term is twice the sum of the succeeding terms, then the common ratio is
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