#ap-sumMCQ

Sum of Terms

Practice Focus level Class 10 math MCQ on sum of terms with answer, solution, FAQ, and exam-focused revision.

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The sum of first 20 terms of an AP with first term 3 and common difference 2 is:

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FAQ

Which formula gives the sum of first $n$ terms of an AP?

Use $S n = n 2 [2 a + (n - 1) d]$ .

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Common mistake: Students sometimes use $n = 19$ because there are 19 gaps, but the number of terms is 20.

Practice a Focus level Class 10 math MCQ on sum of terms with answer and clear solution.