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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
3 years ago

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

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