Asked by Anonymous

the 9th and 22nd term of an a.p are 29 and 55 respectively find the sum of its 30 terms.
Answered by oobleck
Since the 22nd term is 13 terms after the 9th term,
55 = 29 + 13d
Now you can find d and a, and then use your sum formula:

S30 = 30/2 (2a + 29d)
Answered by A shish kumar
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