Question : Directions: In the following question, select the missing number of the given series.
144, 140, 132, 116, 84, ?
Option 1: 30
Option 2: 20
Option 3: 29
Option 4: 25
Correct Answer: 20
Solution :
Given:
144, 140, 132, 116, 84, ?
The pattern is as follows –
144 – 4 = 140;
140 – (4 × 2) = 140 – 8 = 132;
132 – (8 × 2) = 132 – 16 = 116;
116 – (16 × 2) = 116 – 32 = 84;
84 – (32 × 2) = 84 – 64 = 20
So, the missing number of the series is 20. Hence, the second option is correct.
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