Sn =9+5n then find d
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put n = 1, S1 = 9 + 5 × 1 = 9 + 5 = 14
put n = 2, S2 = 9 + 5 × 2 = 9 + 10 = 19
a1 = S1 = 14
a2 = S2 - S1 = 19 - 14 = 5
d = a2 - a1 = 5 - 14 = -9
put n = 2, S2 = 9 + 5 × 2 = 9 + 10 = 19
a1 = S1 = 14
a2 = S2 - S1 = 19 - 14 = 5
d = a2 - a1 = 5 - 14 = -9
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