Central Board Of Secondary Education [CBSE] — 2022 Board Exam CBSE, Class 10 Mathematics Set 2 Code 30/4/2 ; Section A ; Question 4

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New Delhi

The question is "If the First Term of AP is 5, the last term is 15 and sum of first n terms is 30 then find the value of n"

It has given sum of first n terms, not Sum of the Series.

Hence it can not be calculated with formula 30 = n/2 (15+5) ; n = 3

Please consider the question incomplete and award marks to students who attempted it.