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In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
a. Both assertion (A) and reason (R) is true and reason (R) is the correct explanation of assertion (A).
b. Both assertion (A) and reason (R) is true but reason (R) is not the correct explanation of assertion (A).
c. Assertion (A) is true but reason (R) is false.
d. Assertion (A) is false but reason (R) is true.
Assertion: If the sum of the first \( \mathrm{n} \) terms of an AP is given by \( S_{n}=3 n^{2}-4 n \), then its \( n^{\text {th }} \) term is \( a_{n}=6 n-7 \)
Reason: \( n^{\text {th }} \) term of an AP, whose sum to \( n \) terms is \( S_{n} \), is given by \( a_{n}=S_{n}-S_{n-1} \).
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