Identify the number that does not belong in the following series:
12, 18, 27, 36, 49, 54
Show answer & explanation
Correct answer: D
Explanation
12 = 3 × 4
18 = 3 × 6
27 = 3 × 9
36 = 6 × 6
54 = 6 × 9
But 49 = 7 × 7, which does not match the rest of the pattern (multiples of 3 and 6).
So the number that is not included in the series is: 49