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Q: What is the number that is less than 20 and has factor pair sums of 19 11 9?

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No.

"Adds" is a word meaning "sums," and "adze" is an old woodcutting tool.

Could be 31, 33 or 35...

9

There is no pair of perfect squares that sums to 21. And the question is pointless if it is not about perfect squares because in that case there are infinitely many answers.There is no pair of perfect squares that sums to 21. And the question is pointless if it is not about perfect squares because in that case there are infinitely many answers.There is no pair of perfect squares that sums to 21. And the question is pointless if it is not about perfect squares because in that case there are infinitely many answers.There is no pair of perfect squares that sums to 21. And the question is pointless if it is not about perfect squares because in that case there are infinitely many answers.

Well, 1 is equal to 1. 9 is equal to 9. So any number from 0 to 9. I do not think this is what is meant by the question. If you mean any number with more than one digit. There is no such number. Because 11 sums to 2. 19 sums to 10. 21 sums to 3. 29 sums to 11. 111 sums 3. 119 sums to 11. The sums do not grow as fast the increase of digits.

Add all the sums, then divide by the number of sums. (ie. the average.)

Average Function

I'm not sure what you are asking. Sums represent either an increase of one quantity by another quantity, or a combination of two quantities. Two of anything is a pair. Did you mean to ask, "What are sums of pairs?" One common use of a pair in mathematics is an ordered pair, such as (2,3). This can represent a coordinate in a graph, or it can represent a vector. If pairs represent a vector, you add the components, so (2,3) + (40,50) = (42, 53).

The two different pairs of decimals whose sums are 14.1 and one pair involves regrouping on math are 8.4 and 5.7.

An infinite number.

It is deficient: It's only proper divisors are 1, 3, and 7, which sums to 11, which is less than 21.

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