Question

Olive has a number series given by his teacher for a unit test.
He has to find out the next two numbers of the given series to crack the test. The series is:
13, 29, 15, 26, 17, 23, 19, __, __

Help Olive to find out the next two numbers.

• A. 17; 20
• B. 20; 17
• C. 20; 21
• D. 21; 20

Answer 1

The correct option is C 20; 21

In the given series, there are two alternative patterns.

• The first pattern starts with 13 and adds 2 to the previous number to get the next number.
• The second pattern begins with 29 and subtracts 3 from the previous number to arrive at the next number.

First series:
13 + 2 = 15
15 + 2 = 17
17 + 2 = 19
19 + 2 = 21

Second series:
29 – 3 = 26
26 – 3 = 23
23 – 3 = 20

So, the next two numbers of the series are 20, and 21.