From a group of 15 men, 7 women 5 boys and 4 girls,

a) how many can a man, a woman, a boy and a girl be selected?

Exercise 7 (10 points) From a group of 15 men, 7 women, 5 boys and 4 girls, a) How many ways can a man, a woman, a boy and a girl be selected? b) How many ways can a male and a female be selected? c) How many ways can a person be selected? Extra Credit (5 points) A 3 x 3 table is lled in randomly with the numbers -1, 0, and 1. We then compute the sums along each row, the sums along each column, and the sums of the two diagonals. Show that at least two of those sums are equal