Some question: What will come in place of the x in the following Number series? 2, 7, 27, 107, 427, x
Options:
(A) 1427
(B) 1607
(C) 1707
(D) 2047
(E) 2147
Some stream of consciousness:
2
2 4 - 1 = 7
7 4 - 1 = 27
27 4 - 1 = 107
107 4 - 1 = 427
427 4 - 1 = 1707 The answer: (C).