Select the triad in which the numbers are related in the same way as the numbers in the following triads are related.
4 - 18 - 5
7 - 20 - 3
(NOTE : Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 - Operations on 13 such as adding /deleting ‘multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)
1
6 - 16 - 2
2
7 - 12 - 8
3
8 - 11 - 3
4
5 - 21 - 8