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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 \( a_{n}-a_{n-1} \) is not independent of \( n \), then the given sequence is an AP.

Reason: Common difference \( d=a_{n}-a_{n-1} \) is independent of \( \mathrm{n} \) or constant.
(b)
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