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7 is a Prime number, so integers can't be multiplied to make 7. It can't be divided ether (unless by 1 or itself)

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Q: What numbers is 7 divisible by that add to 5?
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Is 5 and 7 coprime?

Coprime numbers are those in which only 1 and that number (say 5) can be divisible by it. Both 5 and 7 would be coprime numbers because they are numbers divisible by only themselves and 1.


How many three-digit numbers are divisible by 7 or 5?

There are 282 such numbers.


Is 1155 divisible by four different prime numbers?

No, the number 1155 is divisible by four prime numbers (3, 5, 7, 11).


How many whole numbers less than 50 are divisible by 5 or 7 but not both?

14. Assuming dealing with only counting numbers (ie integers greater than 0): Numbers divisible by 5 or 7 are their multiples. 50 ÷ 5 = 10 → last multiple of 5 less than 50 is 9 x 5 → 9 numbers less than 50 are divisible by 5 50 ÷ 7 = 71/7 → last multiple of 7 less than 50 is 7 x 7 → 7 numbers less than 50 are divisible by 7 Numbers divisible by both are those which are multiples of their lowest common multiple = 35 50 ÷ 35 = 115/35 → last multiple of 35 less than 50 is 1 x 35 → 1 number less than 50 is divisible by both 5 and 7 and needs to be removed from both the above counts. → (9 - 1) + (7 - 1) = 14 numbers less than 50 are divisible by 5 or 7 but not both. If there is no restriction on numbers being greater than 0, there are infinitely many numbers as it includes the infinite number of negative numbers which are all less than 50 and provide an infinite number of numbers divisible by 5 or 7 but not both.


Which numbers are odd numbers?

1,3,5,7,9 Odd numbers are the ones that if you repeatedly subtract 2 from, you will end with 1. Odd numbers always end in 1, 3, 5,7, and 9. Examples: 23, 37, 51, 69, 75, 87, 99