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In the series 2, 6, 18, 54, ...... what will be the 8th term ?
4370
7443
7434
4374
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1 solution
Clearly, 2 x 3 = 6, 6 x 3 = 18, 18 x 3 = 54,.....
So, the series is a G.P. in which a = 2, r = 3.
Therefore 8th term = ar^8-1 = ar^7 = 2 x 3^7 = (2 x 2187) = 4374.