How would I solve this question?
n(n-1)! the answer is suppose to be n!
(n-1)!(n^2+n) the answer is suppose to be (n+1)!
Can someone tell me how I can approach this problem because im not sure if its a formula based question, the answer is suppose to be 5/17.
A bag contains 10 red jellybeans and 8 black jellybeans.
What is the probability that 2 jellybeans selected at random are red?