In universal set a = { 1, 2, 3, 4, 5, 6, 7, 8, 9} B, = {6, 7, 8} and ` A cup C` = { 1, 2, 3, 4, 5, 6}, then set `(A cup B cup C)` is

Options

A. {1, 2, 3, 4, 5}
B. {1, 2, 3, 4, 5, 6, 7, 8}
C. {1, 2, 3}
D. {9}

Answer

D

Explanation

A = { 1, 2, 3, 4, 5, 6, 7, 8, 9}
`A cup C = {1, 2, 3, 4, 5, 6} B = {6, 7, 8}`
`(A cup B cup C} = {1, 2, 3, 4, 5, 6,7, 8}`
`(A cup B cup C) . = ` Element of set A that does not exist in ` A cup B cup C = {9}`