If a quality control check is made inspecting a sample of 2 light bulbs from a box of 8 lighbulbs, how many different samples can be chosen?
Choose the correct choice from the following choices: A) 6 B) 28 C) 36 D) 66 E) 72
Try using the formula for combinations:   n!/r!(n-r)!   8!/2!(8-2)!   8!/2!*6!    8*7/2*1= 
<gadget id="calculator"> 8*7/2*1</gadget>
<output>28</output>
28   28
<result>B</result>
If a quality control check is made inspecting a sample of 2 light bulbs from a box of 8 lighbulbs, how many different samples can be chosen?