Question

17, 17, 34, 20, 20, 31, 23, ... choose which pair of numbers comes next?
A.26, 23
B.34, 20
C.23, 33
D.27, 28

Answer 1

The option is not given...

It will be 23.28

This is an alternating subtraction series with repetition. There are two different patterns here. In the first, a number repeats itself; then 3 is added to that number to arrive at the next number, which also repeats. This gives the series 17, 17, 20, 20, 23, and so on. Every third number follows a second pattern, in which 3 is subtracted from each number to arrive at the next: 34, 31, 28.