If I flip a coin 20 times, I get a sequence of Heads (H) and tails (T).] i. How many different sequences of heads and tails are possible?
ii. How many different sequences have at most 2 heads?
iii. How many different sequences have at least three heads?

Turner's mom measured his room to see how long the wallpaper border needed to be. if two walls are 15 feet long and two walls are 12 feet long, how long should the strip of border be cut?

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?