Asked by victor

the sum of the first 9 terms of an A.p is 72 and the sum of the next 4 terms is 71. find the A.p. solution

4 years ago

Answered by oobleck

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

4 years ago

Answered by Ade

Answer that please

3 years ago

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