The sum of first n terms of an A.P.`S_n` = …..A)`n/2 [ t_1 + t_n]` B)`n/2 [a+(n-1)d]` C)`n/2 [2 + (n-1)d]` D)none of these

The sum of first n terms of an A.P.`S_n` = …..A)`n/2 [ t_1 + t_n]` B)`n/2 [a+(n-1)d]` C)`n/2 [2 + (n-1)d]` D)none of these
A. `n/2 [ t_1 + t_n]`
B. `n/2 [a+(n-1)d]`
C. `n/2 [2 + (n-1)d]`
D. none of these

The sum of first n terms of an A.P.`S_n` = …..A)`n/2 [ t_1 + t_n]` B)`n/2 [a+(n-1)d]` C)`n/2 [2 + (n-1)d]` D)none of these

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