In a group of 8 girls and 4 boys, how many ways are there to select 2 boys and 2 girls?
A bag contains 12 marbles-3 green, 4 red, and 5 yellow.
3 marbles are randomly selected. Find the probability that 2 marbles are green and 1 is red?
3 marbles are again randomly selected. Find the probability that 3 are yellow.
abc is a randomly selected 3 digit integer from 100 to 999. Find the probability that abc contains exactly 1 digit that is an 8.
The Eagleneck gym has 6 bikes that 9 athletes want to use. At 5pm they randomly select one athlete per bike. If Alan, Bob, Caryn, Darrel, Edgar, and Frank are 6 of the athletes, find the probability that they are all selected.
The final price of a computer is C dollars. This is after a 15% off coupon, 8% sales tax and 4% employee discount. Find an expression for I, the initial price, in terms of the final price.