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Q: How many four digit numbers can be formed from the digits 1 3 7 9?

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pizza

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

9630

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.

there are 4

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10,000

pizza

There are 3 values (1, 2, 3) for each of the 4 digits. Therefore, there are 3*3*3*3 or 81 four digit numbers that can be formed.

4*3*2*1 = 24

128

how make the answer im don/now

256

how make the answer im don/now

The digits product of two digit has number four

1

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

18 (and 6 more starting with a 0).

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