GRE Exam Numerical Ability Probability

If an integer is randomly selected from all positive 2-digit integers
(i.e., the integers 10, 11, 12, . . . , 99), find the probability that the
integer chosen has
(a) a "4" in the tens place
(b) at least one "4"
(c) no "4" in either place

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GRE Other Question

If the probability is 0.78 that Marshall will be late for work at least once next
week, what is the probability that he will not be late for work next week?
In a box of 10 electrical parts, 2 are defective.
(a) If one part is chosen randomly from the box, what is the probability that
it is not defective?
(b) If two parts are randomly chosen from the box, without replacement,
what is the probability that both are defective?