Select the number from among the given options that can replace the question mark (?) in the following series.
1, 1, 2, 2, 6, 10, 42, ?, 1806
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 1010.
Given series: 1, 1, 2, 2, 6, 10, 42, ?, 1806
1. 1, 2, 6, 42, 1806
12 + 1 = 2; 22 + 2 = 6; 62 +6 = 42; 422 + 42 = 1806
2. 1, 2, 10, ?
13 + 1 = 2; 23 + 2 = 10; 103 + 10 = 1010