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The first digit can be any one of 10 digits. For each of those . . .
The second digit can be any one of the remaining 9 digits. For each of those . . .
The third digit can be any one of the remaining 8 digits. For each of those . . .
The fourth digit can be any one of the remaining 7 digits.
The total number of possibilities is (10 x 9 x 8 x 7) = 5,040
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How many different 6 digit serial numbers are available if no digit can be repeated?
9x9x8x7x6x5 = 81x56x30 = 136080
What is the number if there is a 4 digit number no numbers are repeated the digit is odd the digit in the tens place is three times the digit in the thousands place and the sum of the numbers is 27?
3897
What is the largest 4 digit in which no number is repeated?
9,876 since these are the largest single digit numbers that can be done without repeat.
What is the number of 5 digit telephone numbers having atleast one of their digits 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
What is the smallest 6 digit number that only uses prime numbers as digits and one digit is repeated 3 times?
222335
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