No. Of combinations girls can be invited: 5C3 = 10
Now there are 5 possibilities.
1: no boy is invited: 4C0 =1 , combining it with combinations of girls 1 * 10 = 10
2: 1 boy is invited: 4C1 = 4, combining it with combinations of girls 4 * 10 = 40
3: 2 boys were invited: 4C2 = 6, 6 * 10= 60
4: 3 boys were invited : 4C3 = 4, 4 * 10 = 40
5: all boys were invited: 4C4 = 1, 1 * 10 = 10
So, total no of ways of inviting 3 girls = 10 + 40 + 60 + 40 + 10 = 160
So , Correct Answer is 160.