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Q: How many 3 digits positive numbers and which are they?

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Positive 3-digit numbers are any numbers between 100 and 999. They are not negative (no "-" sign in front) and are three digits.

there are 899 whole numbers that have three digits.

It is -987. The smallest positive 3-digit integer with unique digits is 102.

There are 5*4*3 = 60 such numbers.

There are 6 such numbers.

2*3*3*3*3 = 162

from 3 digits (10x10) to 4 digits (99X99)

12 numbers.

900

3*3*3*3=81

You can make 4*4*4 = 64 numbers.

8 digits just count the amount of numbers.

6 if all digits are different, 27 otherwise.

Assuming that the first digit can't be zero: If repetition of digits is permitted: (5 x 6 x 6) = 180 numbers of 3 digits. If repetition of digits is not permitted: (5 x 5 x 4) = 100 numbers of 3 digits.

525

None. 3 digit numbers are not divisible by 19 digit numbers.

27 three digit numbers from the digits 3, 5, 7 including repetitions.

All of them.

125

6*6*3 = 108 numbers.

1 set

All three numbers are significant digits, so 3.

With repeated digits, 43 = 64 Without repeated digits, 4*3*2 = 24

Since the numbers begin with 123, they all contain a 3. As a result, they all "contain 3 or 7". So the remaining 4 digits can be any digits and this gives 104 = 10,000 such numbers.

Three of them.