Question

Which of following is not an AP?

a 2,2,2,2,......

b 10,7,4,........

c 23,21,18,14,.....

d 2,7,12,.........

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Answer 1

Options (C) is the answer..

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Answer 2

answer is c) 23,21,18,14

a2-a1=21-23=-2

a3-a2=18-21=-3

since common difference is not same.therefore sequence is not in AP

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