Select the number from among the given options that can replace the question mark (?) in the following series.
3, 20, 121, 604, 2417, ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 7250.
Given series: 3, 20, 121, 604, 2417, ?
3 × 7 – 1 = 20; 20 × 6 + 1 = 121; 121 × 5 – 1 = 604; 604 × 4 + 1 = 2417; 2417 × 3 – 1 = 7250