5 and 7 are prime numbers. and 3 goes into 9, so the only number that goes into 5, 7, and 9 is 1. They are what we call "relatively prime", even though 9 is not prime, because they have no common factors other than 1.
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The number that goes into both 9 and 5 is 1. This is because 1 is a factor of every integer, including 9 and 5. In other words, both 9 and 5 can be divided evenly by 1.
Just 1
7 times with a remainder of 5
The range is 7.
An example of an infinite geometric sequence is 3, 5, 7, 9, ..., the three dots represent that the number goes on forever.