Question

Find the indicated probability.

A sample of 4 different calculators is randomly selected from a group containing 46 that are defective and 26 that have no defects. What is the probability that all four of the calculators selected are defective? Round to four decimal places.

Answer 1

@Hero

Answer 2

total calculators = 46 + 26 = 72 total calculators

on the first draw, choosing 1 defective calculator ---> (46)/(72)

after the first defective calculator is chosen, there are 45 defective calculators left out of 71, so the probability of getting another defective calculator is (45/71)

repeat this process with all 4 calculators, then multiply the resulting probabilities together