Select the number from among the given options that can replace the question mark (?) in the following series.
3, 20, 121, 604, 2417, ?

Options
a) 7300
b) 7275
c) 7200
d) 7250

Solution

As per question
Logic :-
3, 20, 121, 604, 2417, ?
(3 x 7 – 1) = 21 – 1 = 20 , (20 x 6 + 1) = 120 + 1 = 121 , (121 x 5 – 1) = 605 – 1 = 604 , (604 x 4 + 1) = 2416 + 1 = 2417 , (2417 x 3 – 1) = 7251 – 1 = 7250

Ans is 7250