If a quality control check is made inspecting a sample of 2 light bulbs from a box of 14 lighbulbs, how many different samples can be chosen?  Answers
A) 6  B) 24  C) 36  D) 66  E) 91
Try using the formula for combinations:   n!/r!(n-r)!   14!/2!(14-2)!   14!/2!*12!    14*13/2*1= 
<gadget id="calculator"> 14*13/2*1</gadget>
<output>91</output>
91   91
<result>E</result>
If a quality control check is made inspecting a sample of 2 light bulbs from a box of 14 lighbulbs, how many different samples can be chosen?