Given below, some numbers are arranged in a particular sequence but one of the number is missing. Find the missing number from the given choices to complete the series.
11 21 31 41 ….

Options

A. 42
B. 51
C. 61
D. 71

Answer

B

Explanation

In the above series, there is a gap of ten numbers between the first number and the second consecutive number. To continue the series, the missing number would be 51. Therefore choice ‘B’ is the correct answer to be written in the answer box.