Show that the sequence whose having rth term a, -2n*+n+l is not an A.P – InterviewSolution

InterviewSolution

1.

Show that the sequence whose having rth term a, -2n*+n+l is not an A.P.

Answer»

an = 2n² + n +1 a1 = 2(1)²+1+1 = 4. a2 = 2(2)² + 2 +1 = 11. c.d1 = 11-4 = 7a3 = 2(3)² + 3+1 = 22 cd2 = 22-11 = 11

here common difference is not same i.e 7≠11

so, the sequence is not in A.P

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