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What is the greatest common factor of 20 32 and 88

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20|2\\10|2\\.\ 5|5\\.\ 1|\\20=\fbox2*\fbox2*5\\\\32|2\\16|2\\.\ 8|2\\.\ 4|2\\.\ 2|2\\.\ 1|\\32=\fbox2*\fbox2*2*2*2\\\\88|2\\44|2\\22|2\\11|11\\.\ 1|\\88=\fbox2*\fbox2*2*11\\\\GCF(20;\ 32;\ 88)=\fbox2*\fbox2=4
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