2, 3, 4, 9, 8, 27, 16, (?).
(a) 81
(b) 49
(c) 64
(d) 100
Solution:
In this series there are two groups of numbers.
2, 4, 8, 16 and 3, 9, 27, (?)
2, 4, 8, 16 = 2^1, 2^2, 2^3, 2^4
and 3, 9, 27, (?) = 3^1, 3^2, 3^3, 3^4
Therefore, 3^4 = 81
Answer: 81
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