Assertion and Reasoning — task. Maths CBSE Live product, Class 10 (2026-27).

Assertion (A): Sum of \(n\) terms of an \(A.P.\) \(5,1,-3,-7,-11,..\) is \(-\frac{n}{2}[4n-14]\)

Reason (R): The sum of \(n\) terms of an \(A.P.\) is given by \(S_n=\frac{n}{2}[2a+(n-1)d]\)

Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Assertion (A) is true but reason (R) is false.
Assertion (A) is false but reason (R) is true.

Did you find an error?

2. Assertion and Reasoning