A man has 10 friends,5 men and 5 women.in how many ways can he send invites if he want exactly 3 women to alttend the party?

5C3(5C5 + 5C4 + 5C3 + 5C2 + 5C1 +5C0)

Number of ways in which he can send invitations to three women = $$^5C_3$$ = 10 ways

For each man, he can either send the invitation or not. Number of ways of inviting men = $$2^5$$ = 32 ways

So, total number of ways in which the invitations can be sent = 10 * 32 = 320