AMS employs 6 professors on their staff. Their respective probability of remaining in employment for 10 years are , 0.4, 0.5, 0.6, 0.7, 0.8, 0.9. The probability that after 10 years 6 of them still work in AMS is ?  Choose the correct choice from the following answers.
A) 0.06048  B) 1.22  C) 0.1  D) 0.16  E) none of these
Asking 6 of them continue ,   it has 1 case.   3 6 professors continue   =0.4*0.5*0.6*0.7*0.8*0.9= 
<gadget id="calculator">0.4*0.5*0.6*0.7*0.8*0.9</gadget>
<output>0.06048</output>
0.06048   0.06048
<result>A</result>
AMS employs 6 professors on their staff. Their respective probability of remaining in employment for 10 years are , 0.4, 0.5, 0.6, 0.7, 0.8, 0.9. The probability that after 10 years 6 of them still work in AMS is ?