Question 1056870
There are a total of 44 + 23 = 67 calculators
:
The probability that the first calculator chosen is defective is 44/67, second defective chosen is 43/66, third is 42/65 and fourth is 41/64
:
probability that all four are defective is 44/67 * 43/66 * 42/65 * 41/64 = approximately 0.1771