The sum of the series \( a-(a+d)+(a+2 d)-(a+3 d)+\ldots \) upto \( (2 n+1) \) terms, is (A) \( -...
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The sum of the series \( a-(a+d)+(a+2 d)-(a+3 d)+\ldots \) upto \( (2 n+1) \) terms, is
(A) \( -n d \)
(B) \( a+2 n d \)
(C) \( a+n d \)
(D) 2 nd
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