Question 1006120
The digits 4,5,6,7 and 8 are randomly arranged to form a three 
digit number(Digits are not repeated) Find the probability that
 the number is even and greater than 800. 
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The denominator of the probability is 5P3 = 5*4*3 = 60

The numerator is: choose the 1st digit as 8 one way, the last 
digit 2 ways (4 or 6) and the middle digit any of the remaining 
3 ways:

1*2*3 = 6 

Answer: the probability is 6 ways out of 60 = 6/60 = 1/10

Edwin</pre>