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How many numbers between 10 and 99 inclusive contain different digits? (i.e. 36 has different digits but 33 doesn't)

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How many numbers between 10 and 99 inclusive contain different digits? (i.e. 36 has different digits but 33 doesn't)
posted Jul 18, 2017 by anonymous

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1 Answer

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Best answer

81


1,2 to 99- 99 of total numbers
1, 2 to 9- 9 of 1-digit numbers
11, 22 to 99- 9 of double same digit numbers
99-9-9=81 is the answer

answer Jun 28 by Hanifa Mammadov



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