Question 48

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

6, 10, 18, 34, ?

Solution

The given series is 6, 10, 18, 34, ?

10 - 6 = 4

18 - 10 = 8

34 - 18 = 16

The logic here is the difference between the numbers is twice the previous difference.

The next difference should be 32.

Let the required number be a

$$\Rightarrow$$ a - 34 = 32

$$\Rightarrow$$ a = 32 + 34

$$\Rightarrow$$ a = 66

$$\therefore\ $$The required number is 66.

Hence, the correct answer is Option C

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