Which of the following numbers will replace the question mark (?) in the given series? 18, 71, 21, 76, 24, 81, 27, 86, 30, ?
The given series is 18, 71, 21, 76, 24, 81, 27, 86, 30, ?
Observe that the series consists of two interwoven series:
- Series 1: 18, 21, 24, 27, 30,... (Arithmetic progression with common difference 3)
- Series 2: 71, 76, 81, 86,... (Arithmetic progression with common difference 5)
The question mark (?) is in the second series. Following the pattern of Series 2, the next number would be 86 + 5 = 91.
Therefore, the number that replaces the question mark is 91.
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