At Best Buy they have a 42” TV that sells for $1,250 and is on sale for 15% off. The sales tax is 6.5%. What is the final cost? (Remember to round to the nearest penny)

(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

What is the missing step in this proof ?

When y’all answer can y’all explain too !