class 8 math lesson 25(set)
TRANSCRIPT
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123456
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(184-1918)
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7
- U = {1,2,3,4,5,6,7}, A = {1,2,5}, B = {2,4,7} C = {4,5,6} , () A B = B A() (AB ) = A B() (A C) =A C
,
AB
2
3 4 5
3 6
31243564AB
A = { }
B = { }
AB
=
{1, 2, 3}{x, y, z}{x, y, z,1,2,3}
c12bc56bAB,cbC
14
{5,b,2,c,9}{ b, c, 2 }
A = { a, b, c, 2, 3 } B = { 5, b, 2, c, 9 } {a,b,c,2,3}A B
1.
2.
?? { p, q, r}{ x, y, z}{ d,g,q,r}{ g, q, z}
? ?3
?{2, 3, 4, 5 }{ 3, 4, 5,6 }
U = { 1, 7, 8, 9, 10, a, b, c, d } , A={b, 1, 8, c, 10} B ={a, b, d, 8, 9} () A\B () A B = ?() A B = ?