Asked by Bella

The sum of the first nine terms of an ap is 72 and the sum of the next four terms is 71.find the ap

4 years ago

Answered by Bella

Please help me solve this problem

4 years ago

Answered by oobleck

S9 = 72
S13-S9 = 71

9/2 (2a+8d) = 72
13/2 (2a+12d) - 72 = 71

Now solve for a and d as usual.

4 years ago

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