Question 1191515

in A n B n C will be element that are in all three sets, A, B, and C


A= {z,y,x,w,v,u}
B= {x,w,v,t,s,r}
C= {u,v,p,q,r}

first find (A n B)= {z,y,x,w,v,u} n {x,w,v,t,s,r} = {x,w,v}

then (A n B )n C={x,w,v} n {u,v,p,q,r}= {v}

so,A n B n C= {v}  (only v is element of all sets)