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Find the sum of 50 terms of the A.P. 1 +...

Find the sum of 50 terms of the A.P. 1 + 4 + 7 + ....

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The correct Answer is:
(a) 3725 (b) -700 (c) `(n)/(2)[a(n+1)+2bn]` (d) `(1)/(2)(n+1)` (e) `10(2sqrt(3)-19sqrt(6))`
(f) `(n)/(2)[(n+1)log_(e)a-(n-1)log_(e)b]`
N/a
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