Question

A sequence and is given by an = n×n - 1 , n Belongs to N. show that it is an A.P.
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Answer 1

Answer:

Let n=1

a1=1×1-1=0

a2=2×2-1=3

a3=3×3-1=8

a2-a1=3-0=3

a3-a2=8-3=5

Common difference is not same.

Hence,it is not in AP