###### Asked in Math and Arithmetic

Math and Arithmetic

# How many 2-digit numbers can be produce using the digits 123456789 if repetition is not allowed?

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## Related Questions

###### Asked in Factoring and Multiples

### When multiplying an odd number by an odd number why is the result odd?

The product of multiplication results in a number that has all
of the factors of the two numbers being multiplied. All even
numbers have the prime factor 2. Since no odd number has the factor
2, no product of those numbers can have it. So:
- Odd numbers times odd numbers produce odd numbers.
- Odd numbers times even numbers produce even numbers.
- Even numbers times even numbers produce even numbers.

###### Asked in Pigs, Animal Life

### What is swine prolificacy?

###### Asked in Botany or Plant Biology

### Why do plants produce products that have antimicrobial activity?

Because ancestral plants had mutant genes that made them produce
these products, which acted to protect them from bacteria diseases,
which allowed them to flourish, which allowed them to supplant
rival conspecifics that lacked the genes that caused them to
produce the products, and the living plants of present time
inherited the genes in question from their ancestors.

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