A security guard at a certain store is instructed to check the receipt of one out of every five customers as they are leaving the store. If, on the guard's shift, 15 customers leave the store, how many different samples of customers could have been selected to have their receipts checked?	Choose one:
A) 20
B) 105
C) 59
D) 90
E) 100
to choose the sample of 2 customers from 15. it can be done 15C2 possible ways.   So the answer is 105 105
<result>B</result>
A security guard at a certain store is instructed to check the receipt of one out of every five customers as they are leaving the store. If, on the guard's shift, 15 customers leave the store, how many different samples of customers could have been selected to have their receipts checked?