Select the number from among the given options that can replace the question mark (?) in the following series.
55, 63, ?, 343, 855, 1855
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 127.
Given series: 55, 63, ?, 343, 855, 1855
55 + 23 = 63; 63 + 43 = 127; 127 + 63 = 343; 343 + 83 = 855; 855 + 103 = 1855