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2.5 is not a factor. 5 is prime.
a composite factor is 2 3 5 7 and11. theres more but thats what i got
no 5 is not a composite number 10 15 20 and 25 are composite
The greatest common factor of a prime number & a composite number is 1 if the composite number is not divisible by the prime number. 81(composite number) is not divisible by 29(prime number) so, gcf(29,81) = 1.
No. Any number where 5 is a factor will end in 5 or 0