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1. |
Check whether an = 2n2 + 1 is an A.p. or not. |
Answer» an = 2n2 + 1 Then an+1 = 2 (n + 1)2 + 1 So, an+1 - an = 2(n2 + 2n + 1) + 1 - 2n2 - 1 = 2n2 + 4n + 2 + 1 - 2n2 - 1 = 4n + 2, which is not constant So, The above sequence is not an A.P. |
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