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Decide whether following sequence is an A.P., if so find the 20th term of the progression.

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Decide whether following sequence is an A.P., if so find the 20th term of the progression.

-12, -5, 2, 9, 16, 23, 30,…

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i. The given sequence is

-12, -5, 2, 9, 16, 23, 30,…

The difference between two consecutive terms is constant.

∴ The given sequence is an A.P.

\(\therefore\) 20th term of the given A.P. is 121.

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