If you have 8 New Year greeting cards and you want to send them to 3 of your friends, in how many ways can this be done?  Choose one:  A) 336  B) 720  C) 340  D) 670  E) None
Solution   We have to find number of permutations of 3 objects out of 8 objects. This number is 8P3=8(8-1)(8-2)=8*7*6= 
<gadget id="calculator">8*7*6</gadget>
<output>336</output>
336   336nswer 336
<result>A</result>
If you have 8 New Year greeting cards and you want to send them to 3 of your friends, in how many ways can this be done?