Q: If a quality control check is made by inspecting a sample of 2 lightbulbs from a box of 12 lightbulbs, how many different samples can be chosen?
6
24
36
66
72
Thanks!
-Ellie
6
24
36
66
72
Thanks!
-Ellie
No. of possible ways of choosing 2 lightbulbs from a box of 12 lightbulbs = 12C2 = 12!/(2!)(12 - 2)! = 12!/(2!)(10!) = (12 * 11)/2 = 6 * 11 = 66elliefrance wrote:Q: If a quality control check is made by inspecting a sample of 2 lightbulbs from a box of 12 lightbulbs, how many different samples can be chosen?
6
24
36
66
72
Thanks!
-Ellie
The correct answer is D.
