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ABC ABC ABC is a triangle with a right angle at A A A. M MM and NNN are points on BC BC BC such that AM AM AM is the altitude, and AN AN AN is the angle bisector of ∠BAC\angle BAC∠BAC. If CNNB=21 \frac {CN} {NB} = 21NBCN=21, what is CMMB \frac {CM} {MB} MBCM?
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