$75 to $25 is what cause im so confused

(a) (8%) compute the probability of an even integer among the 100 integers 1! , 2! , 3! , until 100! (here n! is n factorial or n*(n-1)*(n-2) *… 1) (b) (16%) compute the probability of an even integer among the 100 integers: 1, 1+2, 1+2+3, 1+2+3+4, …., 1+2+3+… + 99, and 1+2+3+… + 100

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8