Do you know what yugioh is?

(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

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?