9.Set R= {a, b, c}. Find the number of subsets in set R.
(4 Points)​

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 .

- (2, -7)

- lines r and s and lines t and u must be parallel