Direction: Find the wrong number in the following series 6, 16, 40, 108, 274, 690

The given series is: 6, 16, 40, 108, 274, 690

This appears to be a series where each number is multiplied by a certain factor to get the next number. Let's try to find this factor:

16/6 = 2.67 (approximately) 40/16 = 2.5 108/40 = 2.7 274/108 = 2.54 (approximately) 690/274 = 2.52 (approximately)

As we can see, the factor is not consistent. However, it is close to 2.5 in all cases except for the transition from 40 to 108, where it is 2.7.

Therefore, the number 108 seems to be the wrong number in the series. If we multiply 40 by 2.5, we get 100, not 108. So, the series should be: 6, 16, 40, 100, 274, 690.