Let the sum of the first n terms of a no...

Let the sum of the first n terms of a non-constant A.P., `a_(1), a_(2), a_(3),... " be " 50n + (n (n -7))/(2)A`, where A is a constant. If d is the common difference of this A.P., then the ordered pair `(d, a_(50))` is equal to

(A,50+46A)

(A,50+45A)

(50,50+46A)

(50,50+45A)

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