Q. 8

If the sequence a1, a2, a3,… is in A.P. , then the sequence a5, a10, a15,…is
A. a G.P.

B. an A.P.

C. neither A.P nor G.P.

D. a constant sequence

Answer :

Terms collected from an AP with a common interval between two terms is always in AP, a5, a10, a15…. have a common interval of 5, so it is also in AP.

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