Math, asked by hansarianeil4647, 1 year ago

The sum of first 15 terms of an ap is 675 and next 15 terms is 2025, find the common difference

Answers

Answered by SDmixedWeb

S[15] = (15/2)(2a+14d) S[30] = 675+2025 Now, (15/2)(2a+14d) =675 or, a+7d = 45.....(i) Similarly, (30/2)(2a+29d)=2025 And get the other equation. Perform elimination process with the two equations and get common difference(d).

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