1. ATM personal identification number (PIN) codes typically consist of four-digit sequences of numbers. Find the probability...

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1. ATM personal identification number (PIN) codes typically consist of four-digit sequences of numbers. Find the probability that if you forget your PIN, you can guess the correct sequence
(a) At random
(b) When you recall the first two digits.
2. A random number generator selects two integers from 1 through 40. What is the probability that
(a) Both numbers are even,
(b) One number is even and one number is odd,
(c) Both numbers are less than 30,
(d) The same number is selected twice?
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