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In an AP: (i) given a = 5,d=3, `a_n` = 50, find n and `S_n` . (ii) given a = 7, `a_(13)` = 35, find d and `S_(13)` . (iii) given `a_(12)` = 37, d= 3, find a and `S_(12)` . (iv) given `a_3` = 15, `S_(10)` = 125, find d and `a_(10)` . (v) given d = 5, `S_
A. 5
B. 6
C. 7
D. 8

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