The probability that a certain type of missile will hit the target on any one firing is 0.80. How...

The probability that a certain type of missile will hit the
target on any one firing is 0.80. How many missiles should be fired so that
there is at least 98% probability of hitting the target at lest once?

To win a daily double at a horse race you must pick the
winning horses in the first two races. If the horses you pick have fair odds
against of 3:2 and 5:1, what are the fair odds in favor of your winning the
daily double?