In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces. - In the Series 2, 6, 18, 54, …, what will be the 8th term ?
Answer: B. 4374
Clearly, 2 * 3 = 6, 6 * 3 = 18, 18 * 3 =54,... So ,the series is a G.P. in which a = 2 and r = 3. .'. 8th term = ar(8 - 1) =ar7 = 2 * 37 = (2 * 2187) = 4374.