Asked by Jay
The 9th and 12th term of a AP are 50 and 65 find respectively the sum of it's first 70 terms
Answers
Answered by
oobleck
d = (65-50)/(12-9) = 5
a = 50-8d = 10
S70 = 70/2 (2a+69d) = _____
a = 50-8d = 10
S70 = 70/2 (2a+69d) = _____
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