The probability that a visitor at the mall buys a pack of candy is 30%. If three visitors come to the mall today, what is the probability that exactly two visitors will buy a pack of candy?	Choose the correct choice from the following choices:
A) 0.343
B) 0.147
C) 0.189
D) 0.063
E) 0.027
0.3*0.3*0.7 is equivalent to saying the the first person picks candy and second person picks candy and third person doesn't pick candy.   however this is a different case compared to   0.3*0.7*0.3 is equivalent to saying the the first person picks candy and second person doesn't pick candy and third person picks candy.   which in turn is a different case compared to   0.7*0.3*0.3 (I'll skip the verbose comments)   Hence the answer is   3*(0.3*0.3*0.7)= 
<gadget id="calculator">  3*(0.3*0.3*0.7)</gadget>
<output>0.189</output>
0.189   ANSWER 0.189
<result>C</result>
The probability that a visitor at the mall buys a pack of candy is 30%. If three visitors come to the mall today, what is the probability that exactly two visitors will buy a pack of candy?