A man -x has 7 friends, 4 of them are ladies and 3 are men.his wife -y also 7 friends,3 of them are ladies and 4 are men.assome x and y have no common friends. Then the total number of ways in which x and y together can throw a party inviting 3 ladies and 3 men so that 3 friends of each of x and y are this party
