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  4. Assertion: Number of terms in the expansion of [(3 x+y)8-(3 x-y)8] is 4 Reason: If n is even, then (x+a)n-(x-a)n has (n/2) terms.

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Q. Assertion: Number of terms in the expansion of $\left[(3 x+y)^{8}-(3 x-y)^{8}\right]$ is $4$
Reason: If $n$ is even, then $\left\{(x+a)^{n}-(x-a)^{n}\right\}$ has $\frac{n}{2}$ terms.

Binomial Theorem

Solution:

Correct answer is (a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.