1.

In an ap an=4, d=2, sn=-14, find n and a

Answer»

n = -2 and a = -2

The TWO variables indicates same NUMBER

You gave an = 4, means a X n = 4 and

sn = -14, means s x n = 14

a = -2 x n = -2 = (-2) x (-2) = 4

s = 7 x n = -2 = 7 x (-2) = -14


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