1.When testing for current in a cable with twelve color-coded wires, the author used a meter to test five wires at a time. How many different tests are required for every possible pairing of five wires?

2.Winning the jackpot in a particular lottery requires that you select the correct four numbers between 1 and 62 and, in a separatedrawing, you must also select the correct single number between 1 and 60. Find the probability of winning the jackpot.

3.Assume that when adults with smartphones are randomlyselected, 49% use them in meetings or classes. If 7 adult smartphone users are randomlyselected, find the probability that exactly 4 of them use their smartphones in meetings or classes.