1.

Let the sum of the nth terms of a non-constant A.P., a1, a2, a3,……… be, \(50n + \frac{{n\left( {n - 7} \right)}}{2}A\), where A is a constant. If d is the common difference of this A.P., then the ordered pair (d, a50)is equal to:

A. (50, 50 + 46A)
B. (50, 50 + 45A)
C. (A, 50 + 45A)
D. (A, 50 + 46A)
Answer» E.


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