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( ) - -8 - --

,,, ?

- - -

U

- -

S={ } S= { } 1,3,5,7x, 1 x 7/ Set

1 , 2 , 3 , 4 ,5 , 6 , 7 , 8 ?

A,B,CX,Y,Z

a,b,cx,y,z1,2,3.. A=

B=

a,b,c1,2,3,4X =

Y =

a, b,c,d,e4,5,6,7 ?

xzty

x,y,z,t

/ / such that {x : }

, U / union set /Intersection set

A B A U B A C =? A C () abc312x13a45c= 2TY3 A B =? AT23Y B ( ) A B 42 70 A B 21=12137 P={1,3,7,21}35=13557 Q ={1,5,735}={1,3,7,21}

{1,5,735}

={1,7}

70 =170 = 235 = 514 = 107

B ={1,2,5,7,10,14,35,70}=A={1,2,3,6,7,14,21,42},

{1,2,7,14}

42 =142 = 221 = 314 = 67

{1,2,5,7,10,14,35,70}

{1,2,3,6,7,14,21,42}= U= {1,2,3,4,5,6,7} A = {2,4,6,7} ?) {1,2,4} ) {1,3,5} ) {2,4,6} ) {4,5,6}

A={x:x , 1