Of the three-digit integers greater than 800, how many have distinct digits ?	Pick.
A) 90	B) 82	C) 80	D) 45	E) 36
Three digit number can have only following 3 patterns:   A. all digits are distinct;   B. two digits are alike and third is different;   C. all three digits are alike.   We need to calculate B. B=Total - A - C   Total numbers from 800 to 999 = 299 (3-digit numbers greater than 800);   A. all digits are distinct = 2*9*8= 
<gadget id="calculator">2*9*8</gadget>
<output>144</output>
144   Answer: 82
<result>B</result>
Of the three-digit integers greater than 800, how many have distinct digits ?