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CBSE Class 10 Answered

If the sum of first n,2n and 3n terms of an AP be S1 S2andS3 respectively then p3 S2-S1
Asked by keshavsinghalhapur | 15 Jan, 2024, 10:56: AM
answered-by-expert Expert Answer

Let a is first term and d is common difference of A.P.

Sum of n terms is

img  ................................. (1)

Sum of 2n terms is

img

img

img

Where S3 is sum of 3n terms

Answered by Thiyagarajan K | 15 Jan, 2024, 11:45: AM

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