Math, asked by bhavyamanju24, 7 months ago

sum of first 10 terms of AP 185 and sum of its first 9 terms is 153 if common difference of AP is 3 find sum of its first 21 terms. plzz help me with ths

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Answered by manaswi78

6

Answer:

therefore, sum of first 21 terms = 735.

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