The five term of a series A.P is 19 and 10th term is 39. Find the sum of 12th terms.

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Arun · Answer

Dear Bipin 5th term T5 = 19 = a + 4 d While 10th term = 39 = a + 9d Now Solve both the equations Hence d = 4 So a = 3 Hence sum of 12 terms = (12/2)(2a + 11 d) = 6 (6 + 44) = 300 Regards Arun

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The five term of a series A.P is 19 and 10th term is 39. Find the sum of 12th terms.

The five term of a series A.P is 19 and 10th term is 39. Find the sum of 12th terms.

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