41
Assertion (A): For an A.P., 3, 6, 9, ..., 198, $10^{th}$ term from the end is 168. Reason (R): If 'a' and 'l' are the first term and last term of an A.P. with common difference 'd', then $n^{th}$ term from the end of the given A.P. is $l - (n-1)d$.
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(D) Assertion (A) is false, but Reason (R) is true.