Question

In a party, each boy dances with exactly three girls, each girl dances with exactly four boys. If the total no. of students present at the party are 35, how many boys are ther?

pls help quick ​

Answer 1

Answer:

Therefore, the 3 groups can be chosen 84 x 20 x 1 = 1680 ways. However, since the order of the 3 groups doesn't matter, we have to divide 1680 by 3!. Hence, the number of ways 9 people can be divided into 3 groups is 1680/