A Box Contains 20 Widgets, 4 of Which Are Defective $\frac { 1 } { 4845 } ; \frac { 364 } { 969 }$

question 153

Multiple Choice

A box contains 20 widgets, 4 of which are defective. If 4 are sold at random, find the probability that (a) all aredefective (b) none are defective.

• A) \(\frac { 1 } { 4845 } ; \frac { 364 } { 969 }\)
• B) \(\frac { 1 } { 5 } ; \frac { 4 } { 5 }\)
• C) \(\frac { 1 } { 116,280 } ; \frac { 1 } { 29,070 }\)
• D) \(\frac { 1 } { 20 } ; \frac { 1 } { 5 }\)