If you have 6 New Year greeting cards and you want to send them to 4 of your friends, in how many ways can this be done?	Pick one.
A) 360
B) 720
C) 920
D) 670
E) None
Solution   We have to find number of permutations of 4 objects out of 6 objects. This number is 6P4=6(6-1)(6-2)(6-3)=6*5*4*3= 
<gadget id="calculator">6*5*4*3</gadget>
<output>360</output>
360   360nswer 360
<result>A</result>
If you have 6 New Year greeting cards and you want to send them to 4 of your friends, in how many ways can this be done?