Solve the compound inequality: 30> x+10> 20

a. 20> x> 10
b.40> x> 30
c.2010
d. no possible solutions

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

(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 hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?