C(6,5) * C(3,2)
this is read, 6 choose 5 times 3 choose 2
(65)⋅(32)=(61)⋅(31)=6⋅3=18
Why are you asking us? What is wrong with all the calculators that you have access to?
I do not think that they are all broken. Last time I looked, the web2.0calc was working ok ://