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THERE ARE 200 INDIVIDUALS WITH A SKIN DISORDER,120 HAD BEEN EXPOSED TO THE CHEMICAL C1 ,50 TO CHEMICAL C2, AND 30 TO BOTH THE CHEMICALS C1 $ C2.FIND THE NO: OF INDIVIDUALS EXPOSED TO (i)chemical C1 but not chemical C2 (ii)chemical C2 but not chemical C1 (iii)chemical C1 or chemical C2