Solve

Asked by  | 29th Jun, 2008, 05:51: PM

Expert Answer:

Solution:-

This is an A.P. with common difference 4 and 1st term as 5.Here Number of terms will be n = l -a/d   + 1

69-5/4 + 1 = 64/4 + 1 = 16 + 1 = 17

Sn = 17/2 (a + l) = 17/2 * 74 = 17*37 = 629

Answered by  | 29th Jun, 2008, 08:41: PM

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