a) A∨B={1, 2, 3, 4, 5, 6,7, 8, 9}
b)A∨C={1, 2, 3, 4, 5, 6, 7, 12}
c)B∨C={1, 2, 3, 5, 6, 7, 8, 9, 12}
d)A∧B={5, 6, 7}
e)A∧C={1, 2, 3, 7}
f)B∧C={7}
g)A∨B∨C=∨{1, 2, 3, 4, 5, 6, 7, 8, 9, 12}
h)A∧B∧C={7}
i)A/B={1, 2, 3, 4}
j)B/C={5, 6, 8, 9}
K)A/C={4, 5, 6}
l)A∨(B∧C)=A∨{7}= {1, 2, 3, 4, 5, 6, 7}