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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