A shipment of 9 printers contains 2 that are defective find

A shipment of 9 printers contains 2 that are defective find the probability that a sample of size 4 drawn born the 9, will not contain a defective putter. The probability is

Use a proportion. Put: 2/9 = x/4 solve by cross multiplying.
So 9 times x is 9x and 2 times 4 is 8.
9x = 8
Divide each side by 9.

x = 8/9