Which number best complete 2 6 3 8 6 12?

Answer 1

11

Look at the series:

2 & 6 +4

6 & 3 -3

3 & 8 +5

8 & 6 -2

6 & 12 +6

See the pattern that develops you switch between adding & subtracting. The additions increase by one each time & the subtractions decrease by 1. So following the pattern, the next number 12 subtracted by 1, since subtraction is the next operation in the series & the previous subtraction was by 2, so the next one will be by 1. Hence, 12 -1 = 11