Question

Three different sets of objects contain 4, 5, and 12 objects, respectively. How

many unique combinations can be formed by picking one object from each
set?
A. 21
B. 240
C. 60
D. 48

Answer 1

`\text{B. }240}`

Explanation:

`\binom{4}{1}\cdot\binom{5}{1}\cdot \binom{12}{1}=\boxed{\text{B. }240}}`

(Multiplying each of the numbers also yields 240)