Question

sendo A= {1;2;3;4} e B= {1;2;3;4;5;6;7}, obtenha:
a) B - A
b) A - B
c) C b A
d) C a B​

Answer 1

$A=\left\{1,2,3,4\right\}$

$B=\left\{1,2,3,4,5,6,7\right\}$

a)

$B-A=\left\{5,6,7\right\}$

b)

$A-B=\varnothing$

c)

$C^{B}_{A}=A-B=\varnothing$

d)

$C^{A}_{B}=B-A=\left\{5,6,7\right\}$