From 9 distinct jobs, the number of ways to select 3 for audit is most nearly:
- (A)42 ways
- (B)84 ways
- (C)126 ways
- (D)168 ways
Show worked solution
Answer: (B)
The combination count is 84.
The event or sampling model determines the required statistic.
Substitution and unit reduction give the reported value.
FE Reference Handbook — Probability: Combinations
Why the other choices appear
- (A)This introduces an extra factor of 0.5 that is not present in the governing relation.
- (C)This value is 50% above the verified result; no stated conversion creates that change.
- (D)The units are retained, but an unsupported 2 multiplier changes the requested magnitude.