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.

Algebra.Com
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.
Answer by Edwin McCravy(20081)   (Show Source): 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
RELATED QUESTIONS

A box contains 50 razor blades, five of these are known to be used, the remainder unused. (answered by stanbon)
In a razor blade factory, machines A,B and C manufacture 25%, 35% and 40% of the total... (answered by ikleyn)
In a razor balde factory, machines A,B abd C manufacture 25%, 35% and 40% of the total... (answered by ikleyn)
A box contains 50 computer chips of which 8 are known to be bad. A chip is selected at... (answered by ewatrrr)
In a shipment of 50 calculators, 5 are known to be defective. If 6 calculators are picked (answered by ewatrrr)
A box contains 50 balls numbered from 1 to 50. If 10 balls are drawn with replacement,... (answered by stanbon,Alyrian)
In California, 50% of all teenagers own a skateboard and 40% of all teenagers own a... (answered by stanbon)
A box contains 25 transistors, of which 4 are known to be bad. A transistor is selected... (answered by stanbon)
A slitter assembly contains 48 blades. Five blades are selected at random and evaluated... (answered by ikleyn)