Of the three-digit integers greater than 600, how many have distinct digits ?	Choose one
A) 90  B) 82  C) 80  D) 45  E) 288
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 600 to 999 = 299 (3-digit numbers greater than 600);   A. all digits are distinct = 4*9*8= 
<gadget id="calculator">4*9*8</gadget>
<output>288</output>
288   Answer: 288
<result>E</result>
Of the three-digit integers greater than 600, how many have distinct digits ?