# ICSE Class 10 Answered

**When do we use s=n/2(a+l) formula and when do we use s=n/2 x {2a+(n-1)d} formula in the sum of a.p?**

Asked by rashikulkarni28 | 14 Aug, 2022, 04:32: PM

Expert Answer

When we have given or can find first term and last term, then to find the sum we can use the formula S = n/2(a+l)

If the first term and common difference are given or can be obtained with the given information, we must use the S = n/2(2a+(n-1)d) to get the sum

Answered by Renu Varma | 15 Aug, 2022, 09:56: AM

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