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

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

A.

7275

B.

7250

C.

7200

D.

7300

Correct option is B

Given - 3, 20, 121, 604, 2417, ?
Logic = Continuous multiplication with 7, 6, 5, 4 --- so on with subtraction 1 and addition 1 alternatively.
3 ×7 - 1 = 21 - 1 = 20
20 ×6 + 1 = 120 + 1= 121
121 ×5 - 1 = 605 - 1= 604
604 ×4 + 1 = 2416 + 1 = 2417
2417 ×3 - 1 = 7251 - 1= 7250
hence correct missing term is 7250

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