If the first term of an A.P. is -5 and the common difference is 2, then the sum of its first 6 terms is
(a) 0
(b) 5
(c) 6
(d) 15
Solution:
The sum of 25 terms of the A.P. is
(a) 0
(b)
(c)
(d) -50
Solution:
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