U = {1, 2, 3, 4, 5, 6, 7}, X = {1, 3, 5}, Y = {2, 4, 6} হলে X´ ∩ Y´ = কত?

দেয়া আছে,
U ={1, 2, 3, 4, 5, 6, 7},
X ={1, 3, 5}
Y= {2, 4, 6} 

X´ = U - A
    = {1, 2, 3, 4, 5, 6, 7} - {1, 3, 5}
    = {2, 4, 6, 7}

Y´ = U - B
    = {1, 2, 3, 4, 5, 6, 7} - {2, 4, 6}
    = {1, 3, 5, 7}

X´ ∩ Y´= {2, 4, 6, 7} ∩ {1, 3, 5, 7}
           = {7}