The sum of two numbers is 70. They differ by 11. What are the numbers? Use substitution to solve this system of equations.

(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

Me with this one question, and i'll upvote the brainliest answer

This is so hard and it’s for a test