Which of the following numbers will replace the question mark (?) in the given series?
7 13 39 46 138 146 438 447 ?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 1341.
Given series: 7 13 39 46 138 146 438 447 ?
7 + 6 = 13; 13 × 3 = 39; 39 + 7 = 46; 46 × 3 = 138; 138 + 8 = 146; 146 × 3 = 438; 438 + 9 = 447; 447 × 3 = 1341