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Mathematics · 2023 · 1 mark
CBSE 2023 · Region 4 · Set 1 · Q20
Assertion (A): a, b, c are in A.P. if and only if 2 b = a + c. Reason (R): The sum of first n odd natural numbers is n^2.
Assertion (A) : a, b, c are in A.P. if and only if $\displaystyle 2 \mathrm{~b}=\mathrm{a}+\mathrm{c}$.
Reason (R) : The sum of first n odd natural numbers is $\displaystyle \mathrm{n}^{2}$.
Official answer
(B)
Both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of Assertion (A).
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CBSE Class 10 Mathematics past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.