Answer:
6
Explanation:
72={1,2,3,4,6,8,9,12,18,24,36,72}
90={1,2,3,5,6,9,10,15,18,30,45,90}
126={1,2,3,4,6,7,9,1418,21,42,63,126}
Common factors of 72,90 and 126
1,2,3,4,6
6 is greater than 1, 2, 3 and 4.
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72 90 126............ (2)
36 45 63..............(3)
12 15 21...............(3)
4 5 7................can't be divided more.
So, 2 x 3 x 3 = 18 is the biggest common factor of 72, 90, and 126.
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