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the answer would seem to be ten.

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25 is the smallest 2 digit number having exactly 4 factors

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16

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10

Q: What is the smallest two digit number that only has 4 factors?

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10, which has the factors 1,2,5 and 10. If the trivial pair 1 and the number itself are disallowed, the answer is 12 with factors 2,3,4 and 6.

1000 is the smallest 4 digit number but of the two factors, it is only divisible by 2. As 999 is obviously divisible by 3 then 999 + 3 = 1002 is also divisible by 3 and, as an even number, is also divisible by 2. The answer is 1002

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

The smallest three-digit even number is -998. However, while considering only positive numbers, the smallest three-digit number even number is then 100.

The largest 5-digit number is 99,999, the smallest is .00001,and the difference is 99,998.99999 .If you only want to consider whole numbers, then the smallest is 10,000and the difference is 89,999 .

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10

101 is the first three-digit prime number.

It is 103 which is a prime number because it has only two factors which are itself and one

It is 11 which is a prime number whose factors are itself and one

10, which has the factors 1,2,5 and 10. If the trivial pair 1 and the number itself are disallowed, the answer is 12 with factors 2,3,4 and 6.

Since there are only five different digits, a 6-digit number can only be generated if a digit can be repeated. If digits can be repeated, the smallest 6-digit number is 111111.

The smallest six-digit even number is 100,000

If you allow non integers, then your smallest four-digit number would be .0001. If you only allow integers, then your smallest four-digit number would be 1000. Your largest four-digit number would be 9999.

1111

1000 is the smallest 4 digit number but of the two factors, it is only divisible by 2. As 999 is obviously divisible by 3 then 999 + 3 = 1002 is also divisible by 3 and, as an even number, is also divisible by 2. The answer is 1002

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

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