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

Assertion (A): The sum of the first \(28\) multiples of \(15\) is \(6090\).

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

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

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4. Assertion and Reasoning

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