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The answer is 11.

To find the Greatest Common Factor of a set of numbers, first find the prime factors of each number.

77 = 7 x 11

132 = 2 x 2 x 3 x 11

143 = 11 x 13

Then notice the factor(s) in common to every number, and multiply them together if there are more than one.

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12y ago

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