Posted by **Matrix School 2** on Wednesday, July 15, 2009 at 2:46pm.

let U=[a,b,c....z],.A=[a,c,e,f,z,y],..

B=[e,x,y,z],.C=[j,k,l,e,f,y]

find

(i)(AUC)'

(ii) AU(B-A)

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