Question 35

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

4, 5, 9, 18, 34, 59, ?, 144, 208, 289

Solution

The logic here is

$$5-4=1=1^2$$

$$9-5=4=2^2$$

$$18-9=9=3^2$$

$$34-18=16=4^2$$

$$59-34=25=5^2$$

The difference between numbers of the given series is square of consecutive numbers

Similarly, the required number = 59 + 6$$^2$$ = 59 + 36 = 95

Hence, the correct answer is Option A

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