If Sn denote the sum of n terms of an A.P. with first term a and commo – McqOptions

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1.	If Sn denote the sum of n terms of an A.P. with first term a and common difference d such that $$\frac{{{S_x}}}{{{S_{kx}}}}$$ is independent of x, then
A.	= a
B.	= 2a
C.	= 2d
D.	= -a
Answer» C. = 2d

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