The nth term of a progression is (n2 -n-1). Prove that it is an ap
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a1 = 1^2 - 1 - 1 = -1
a2 = 2^2 - 2 - 1 = 1
a3 = 3^2 - 3 - 1 = 5
a4 = 4^2 - 4 - 1 = 11
it is not in AP
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