CBSE Class 10 Answered
Solve
Asked by | 29 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 | 29 Jun, 2008, 08:41: PM
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