A sample of 4 different calculators is randomly selected from a group containing 47 that are defective and 29 that have no defects. What is the probability that all four of the calculators selected are defective? Round to four decimal places.

Answer 1

47+29 = 76

first one 47/76
second on 46/75
third one 45/74
fourth one 43/73

multiply :)

Answer 2

456