Help pls I'd be appreciated ​

(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

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?