In this type of classification, a group of jumbled letters, typically
consisting a single or two or three or four letters are put together. The
pattern or order in which they are grouped is to be identified and students need
to find out which groups have the same pattern or relationship between the
letters. There will be only one choice, which will have a different pattern from
the rest and hence becomes the answer option.
Example 1: Find the odd one among the following.
(a) LY (b) GU
(c) DQ (d) JW
Solution. (b) Corresponding places in the first half and the second half
of letters, except option (b).
In such questions, students need to choose the odd number from the given
options. The numbers may belong to a particular pattern, i.e., they may be odd,
even, prime, rational, squares, cubes and they may also be coded into binary
digits (0 s and 1 s), etc. and only one of the choices will not follow the same
Example 2 : Find the odd man out.
(a) 35 (b) 55
(c) 45 (d) 65
Solution. (c) Except option (c) , the remaining are prime products of 5.