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Find the GCF:

`21 c^27 b^3`,  `14 c^15 b^8`,  `203 c^29 b^6`

GCF =  

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   x  x    n  |   | (   ) π DNE
   x    (   ) π DNE
( ) ( ] [ ) [ ] —∞ DNE
< > or All Real Numbers DNE
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