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How many terms of the AP 9, 17, 25, … must be taken so that their sum is 636?

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How many terms of the AP 9, 17, 25, … must be taken so that their sum is 636?

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The given AP is 9, 17, 25,…… 

Here, a = 9 and d = 17 - 9 = 8

Let the required number of terms be n. Then,

Hence, the required number of terms is 12.

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