In an A.P., given a = 7, a13 = 35, find d and S13.
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In an A.P., given a = 5, d = 3, an = 50, find n and Sn.
In an A.P., given a12 = 37, d = 3, find a and S12.
In an A.P., given a3 = 15, S10 = 125, find d and a10.