Question 66

The numbers in the figure below have certain logic/pattern. Using that logic/pattern, find out the number that can be inserted in place of '?'.

Solution

The pattern here is as follows:

Each number is found by multiplying the previous number by 2 and then subtracting a consecutively increasing integer.

The number 4 is given.

4 × 2 − 1 = 7

7 × 2 − 2 = 12

12 × 2 − 3 = 21

21 × 2 − 4 = 38

Next Number: 38 × 2 − 5 = 76 − 5 = 71.

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