SOLUTION: A box contains 50 razor blades, five of these are known to be used, the remainder unused. What is the probability that exactly 3 will be used.
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Question 247538: A box contains 50 razor blades, five of these are known to be used, the remainder unused. What is the probability that exactly 3 will be used.
You can put this solution on YOUR website! A box contains 50 razor blades, five of these are known to be used, the remainder unused. What is the probability that exactly 3 will be used.
The numerator is the number of successful ways, which is the
number of ways to select exactly 3 from the 5 used.
That's "5 choose 3"
or 5C3 =
The denominator is the number of possible ways, which is the
number of ways to select exactly 3 from the total 50.
That's "50 choose 3"
or 50C3 =
So the desired probability is
Edwin
