Three of the following four options are alike in a certain way and thus form a group. Which is the one that does NOT belong
to that group?
(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/subtracting/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
26 – 95 – 21
2
22 – 67 – 22
3
20 – 15 – 51
4
16 – 45 – 21