Which of the following numbers will replace the question mark (?) in the given series?
10, 27, 78, 231, ?, 2067
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 690.
Given series: 10, 27, 78, 231, ?, 2067
The series follows this pattern:
10 + 17 = 27
27 + (17 × 3) = 27 + 51 = 78
78 + (51 × 3) = 78 + 153 = 231
231 + (153 × 3) = 231 + 459 = 690
690 + (459 × 3) = 690 + 1377 = 2067
So, the missing term in the series is 690.