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Q: What is the least 9 digit number no digit repeated?

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What is the least possible 6 digit odd number with only using 1 to 9 once

9876543210

With no digit rejected, 999999999 With no digit repeated, 987654321

987654321 is the highest nine-digit number with no repeated digits.

172803456069120

102345678 If you allow decimals: 0.12345678 If you allow negative numbers: -987654321

The least three-digit number that is divisible by both 5 and 9 is 135.

123,456,789

9x8x7x6x5x4x3x2x1 or 9! which equals 362880 possible combinations if no digits are repeated

5 digit telephone numbers having at least one of their digits repeated is = total possible 5 digit telephone numbers - 5 digit telephone numbers without any digit being repeated. =(10*10*10*10*10)-(10*9*8*7*6) =100000-30240 =69760

Use the highest possible digit (9) for all 12 digits.

111 111 111 If you multiply 12345679 by any two digit number* where the first digit is less than 9 and the sum of the digits is 9 (eg 36), the answer will consist of a single digit repeated 9 times. This will be the first digit of the two digit number plus 1 (eg multiplying by 36 will create an number consisting of only the digit 3+1 = 4: 12345679 x 36 = 444 444 444). *Multiplying by 9 is multiplying by the "two" digit number "09", giving an answer consisting of the single digit 0+1 = 1 repeated.

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