Tough and Tricky questions: Combinations.
The product of the digits of the four-digit number h is 60. No two digits of h are identical. How many different numbers are possible values of h?  Select:
A) 20	B) 22	C) 24	D) 30	E) 36
Answer = 24 = 24   Let number =abcd   Given that a*b*c*d = 60   a,b,c,d can be 1,2,3,10   Number of ways = 4*3*2= 
<gadget id="calculator">4*3*2</gadget>
<output>24</output>
24
<result>C</result>
Tough and Tricky questions: Combinations.
The product of the digits of the four-digit number h is 60. No two digits of h are identical. How many different numbers are possible values of h?