Question 1173434
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Hi
9 numbers:  0,1,2,3,4,5,6,7,8
How many of these are <U>less than 40</u>?
 tens digit: 3 allowed (1,2,3)
 ones digit: 9  allowed
  3x9 = 27 two-digit numbers  less than 40
Repeating not allowed: 11,22,33
 27 - 3 = 24  two-digit numbers less than 40, Repeating not allowed