Assertion and Reasoning — task. Maths CBSE Live product, Class 9 (2026-27).

Assertion (A): The sum of the first \(25\) multiples of \(33\) is \(10725\).

Reason (R): The sum of the first \(n\) multiples of any positive integer \(k\) is

k (\frac{n (n + 1)}{2})

Choose the best answer

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

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4. Assertion and Reasoning

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