Question

7. Find the sum of first 22 terms of an AP in which d= 7 and 22nd term is 149.
8. Find the sum of first 51 terms of an AP whose second and third terms are 14 and 18
respectively.
9. If the sum of first 7 terms of an AP is 49 and that of 17 terms is 289, find the sum of
first n terms.
10
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Answer 1

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