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The first term of an A.P. is 2 and the n...

The first term of an A.P. is 2 and the nth term is 41. What is the value of n, if `S_(n) = 860` ?

A

30

B

31

C

40

D

41

Text Solution

Verified by Experts

The correct Answer is:
C
`[ S_(n ) = ( n )/(2) ( a+l)]`
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