Number Classification :
this case, we need to choose the odd number from the given alternatives. The
numbers may belong to a particular set, i.e. they may be odd, even, prime,
rational, squares, cubes, and they may also be coded into binary digits (involving
0's and 1 's) etc. and only one of the choices will not follow the rule which
others do and that is our answer. A few illustrations are given below.
Find the odd one among the following.
(a) All the given numbers except 27
are prime numbers whereas 27 is a composite number.
(b) The given numbers can be written as (21)2,
(17)2, (19)2, (7)3.
All except 343 are the squares whereas 343 is a cube.