If t = 20! + 17, then t is divisible by which of the following?
I. 15
II. 17
III. 19	Choose the correct choice from the following answers:
A) None
B) I only
C) II only
D) I and II
E) II and II
Another crude way to answer this, if you did not know the properties above would be to consider that that 20! will have the number ending in 00 due to 10 and 20 being included.   So t!+17 = xxxx00 +17= 
<gadget id="calculator">00 +17</gadget>
<output>17</output>
xxxx17 which is only possibly divisible by 17. Hence Option II only is the answer.
<result>C</result>
If t = 20! + 17, then t is divisible by which of the following?
I. 15
II. 17
III. 19