Answer:
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Step-by-step explanation:
The value of y is a number equal to 3
27 prime factors: 9*3 prime factors of 9: 3*3
117 prime factors: 39*3 prime factors of 39: 13*3
that would make 3 the greatest common factor. for the other ones break down the numbers into the smallest amount and see which largest factor both numbers have in common.
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The answer would be c.lllllllllllllllllllllllll:)
