bantu jawab yang nomor dua +cara nya

A = { 6,7,8,9,10, ....}
B = { 4.5.6.7 }
C = { 6,7,8,9 }

( A n B ) = { 6,7}
( B n C ) = { 6,7 }
( A U B ) = { 4,5,6,7,8,9,10, ....}
( A U C ) = { 6,7,8,9,10, ....}
( B U C ) = { 4,5,6,7,8,9 }

a. (6,7) U (6,7) = (6,7)
b. (6,7,8,9,10,...) n ( 4,5,6,7,8,9,10, ...) = ( 6,7,8,9,10,...)
c. (4,5,6,7,8,9) n ( 6,7,8,9,10,...) = (6,7,8,9,10,..)