Directions for Questions 36 - 40: What will come in place of the question mark (?) in the given series?
26, 50, 122, 170, ?
196
225
256
290
324
Solution
The numbers in the series are one greater than the square of primes.
$26=5^2+1$
$50=7^2+1$
$122=11^2+1$
$170=13^2+1$
So, the next number in the series should be:
$290=17^2+1$