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Mathematics · 2025 · 1 mark
CBSE 2025 · Region 4 · Set 3 · Q20
Assertion (A): Unit digit of 3^n cannot be an even number for any natural number n. Reason (R): 2 is not a prime factor of 3^n for any natural number…
Assertion (A) : Unit digit of $\displaystyle 3^{n}$ cannot be an even number for any natural number $\displaystyle n$.
Reason (R) : $\displaystyle 2$ is not a prime factor of $\displaystyle 3^{n}$ for any natural number $\displaystyle n$.
Official answer
(A)
Both, Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).
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CBSE Class 10 Mathematics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.