In how many ways can 5 different rings be worn in four particular fingers? (Some fingers may get more than one ring and some may get no rings.)
Can somebody explain?
Choose one:
A) 6720  B) 7720  C) 7820  D) 7950  E) 8120
First ring can be worn in 4 ways (on any of the four fingers);   Second ring can be worn in 5 ways (as it can go on any of four fingers - 4 ways; plus it can go below the first one - 1);   Third ring can be worn in 6 ways (the same logic as for the second ring);   Fourth ring can be worn in 7 ways;   Fifth ring can be worn in 8 ways;   Total:  4*5*6*7*8= 
<gadget id="calculator"> 4*5*6*7*8</gadget>
<output>6_720</output>
6720. 6720NS:6720
<result>A</result>
In how many ways can 5 different rings be worn in four particular fingers? (Some fingers may get more than one ring and some may get no rings.)
Can somebody explain?