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The Highest Common Factor (HCF) of 55, 77, and 132 is the largest number that divides all three numbers without leaving a remainder. To find the HCF, you can first find the prime factors of each number: 55 = 5 x 11, 77 = 7 x 11, and 132 = 2^2 x 3 x 11. Then, identify the common prime factors among the numbers, which are 11. Therefore, the HCF of 55, 77, and 132 is 11.
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