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Let the sum of the first n terms of a non-constant A.P., a 1 , a 2 , a 3 , …….. be 50n + 2 ) 7 – n ( n 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 :

1. (50, 50 + 46A)
2. (50, 50 + 45A)
3. (A, 50 + 45A)
4. (A, 50 + 46A)

Correct answer: (A, 50 + 46A)

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