How many integers between 4000 and 5000 that have distinct digits and increase from left to right ?	Select the correct option:
A) 10  B) 48  C) 60  D) 20  E) 600
Since the numbers must be distinct and increasing from left to right,   The only arrangements we could come-up with are:   445_ --&gt; 4   446_ --&gt; 3   447_ --&gt; 2   448_ --&gt; 1   456_ --&gt; 3   457_ --&gt; 2   458_ --&gt; 1   467_ --&gt; 2   468_ --&gt; 1   478_ --&gt; 1   Number of integers =20   20
<result>D</result>
How many integers between 4000 and 5000 that have distinct digits and increase from left to right ?