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Any pair of digits (not including 0), can be used to generate 14 four-digit numbers. If one of the digits is 0, only seven will start with a non-zero digit.

Q: How many four digit numbers are there which have exactly the same two digits.?

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there are 4

you take the four digits and multiply 4 by 4 you get 16 digits

You had me until "product." The product of 4 digits can't be prime.

The numbers from 1000 to 9999 are all 4 digits, as are -1000 to -9999. Therefore there are 18,000 four-digit numbers in all.

The numbers from 1000 to 9999 are all 4 digits, as are -1000 to -9999. Therefore there are 18,000 four-digit numbers in all.

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1234, 2637, 7777, 2727 are examples of a four digit number. So any random four numbers are four digits.

how many numbers exactly have 4 digits ? 8900, 8999, 9000, 9999

500

there are 4

you take the four digits and multiply 4 by 4 you get 16 digits

You had me until "product." The product of 4 digits can't be prime.

The numbers from 1000 to 9999 are all 4 digits, as are -1000 to -9999. Therefore there are 18,000 four-digit numbers in all.

Thousands would be your 4 digit numbers - 1000-9999.

If the digits can be repeated, then there are (5 x 5 x 5 x 5) = 625 different four-digit numbers.If the digits can't be repeated, then there are (5 x 4 x 3 x 2) = 120 different four-digit numbers.

Four digit numbers span from 1000 to 9999. This totals (9999-1000) +1 = 9000 different four digit numbers

1348.