Select the number that can replace the question mark in the following series 15 18 13 20 11 ........

Logical Reasoning (CPO) Number series

Select the number that can replace the question mark (?) in the following series.

15, 18, 13, 20, 11, ?

- The series given is: 15, 18, 13, 20, 11, ?

- Let's observe the pattern:

- From 15 to 18, the difference is +3.

- From 18 to 13, the difference is -5.

- From 13 to 20, the difference is +7.

- From 20 to 11, the difference is -9.

- The series alternates between adding a number and then subtracting a number.

- The numbers added or subtracted are increasing by 2: +3, -5, +7, -9...

- Following this pattern, the next step should be adding 11 after 11.

- Hence, 11 + 11 = 22.

- Option 3: 22 is the correct answer.

Submit Error