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Q. |
to find sum of A.P. Sn = |
A. | n/2 [2a + (n -1)d] |
B. | n/2 [2a + d] |
C. | n/2 [2a +(n-1)] |
D. | None |
Answer» A. n/2 [2a + (n -1)d] |
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