Select the number from among the given options that can replace the question mark (?) in the following series.
18, 3, 36, 6, 54, 9,?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 72.
Given series: 18, 3, 36, 6, 54, 9,?
The series is alternate with two series;
1. 18, 36, 54,?
18 × 2 = 36
18 × 3 = 54
18 × 4 = 72
2. 3, 6, 9
3 × 2 = 6
3 × 3 = 9
So, the next term in the series is 72.