A) 57
B) 60
C) 66
D) 64
Correct Answer: D
Solution :
(d): The nth term of an AP is given by \[{{T}_{n}}=a+(n-1)\], where a is the first term and d is the common difference. \[\therefore {{T}_{21}}=4+(21-1)3=4+60=64\]You need to login to perform this action.
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