What is the ratio of the number of composite integers to the number of prime integers in the interval [1,10]?

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Correct Answer: **A.** *5:4*

We need to figure out which numbers are primes and which ones are composite. The following shows primes in blue and composites in red: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. Note that 1 is neither prime nor composite, it only has one factor. We have 5 reds and 4 blues. The correct answer is A.

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