Given:
The set is:

To find:
The number of subsets in set R.
Solution:
Formula for number of subsets in a set of
elements is
Number of subsets =
...(i)
We have,

Here, the number of elements are 3. Putting
in (i), we get
Number of subsets =

=

Therefore, the number of subsets is 8 and the subsets are
and
.