Question 206744
How many three digit numbers can be made using only the digits 1 to 9 so that at least two of the digits are the same? For example, 112 and 737 are two such numbers.
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# with >= 2 the same = (total # of 3 digit numbers) - (number with no repeats)
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# of 3 digit with no restrictions = 9^3
# of 3 digit with no repeats = 9*8*7 = 
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So, # with >= 2 the same = 9^3-9*8*7 = 9(9^2-56)= 9(25) = 225
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Cheers,
Stan H. 
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(A) 100 (B) 200 (C) 216 (D) 225 (E) None of these