Q. 195.0( 1 Vote )

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Answer :

As we know sum of A.P

Where, a is first term

d is difference between terms

a = 9, d = 17-9 = 8

Given sum = 636

So,

But n can’t be negative.

So, n = 12

Conclusion: Therefore, 12 terms to be taken for sum to be 638

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