Select the number from among the given options that can replace the question mark (?) in the following series.
13, 51, 205, 819, 3277, ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 13107
Given series: 13, 51, 205, 819, 3277, ?
The logic used here is:
(13 x 4) - 1 = 51
(51 x 4) + 1 = 205
(205 x 4) - 1 = 819
(819 x 4) + 1 = 3277
Similarly, (3277 x 4) - 1 = 13107
Hence, option 2 is the correct option.