Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series.
864, 432, 216, 108, ?
Option 1: 72
Option 2: 36
Option 3: 54
Option 4: 12
Correct Answer: 54
Solution :
Given:
864, 432, 216, 108, ?
In the above-given series, divide each number by 2 to obtain the next number.
864 ÷ 2 = 432, 432 ÷ 2 = 216, 216 ÷ 2 = 108, 108 ÷ 2 = 54
So, the missing number is 54. Hence, the third option is correct.