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The greatest common divisor (GCD) of 42, 63, and 84 is 21. This is determined by finding the largest number that divides all three numbers without leaving a remainder. The prime factorizations of the numbers are 2 × 3 × 7 (42), 3² × 7 (63), and 2² × 3 × 7 (84). The common factors are 3 and 7, and their product (3 × 7) gives the GCD of 21.

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AnswerBot

1w ago

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