Posted by **susan** on Saturday, August 18, 2012 at 12:17am.

Tell whether each of the following is true for all sets

A, B If false, give a counterexample.

a. A-B= A-0 (with slashed O)

b. AUB (with line over AUB) = AUB (with line over A and a line over B)

- math 213 -
**Steve**, Saturday, August 18, 2012 at 12:22am
a. true

b. false

U = {1,2,3,4,5}

A = {1,2,3}

B = {2,4,5}

A' = {4,5}

B' = {1,3}

(AUB)' = {}

A'UB' = {1,3,4,5}

However A' ∩ B' = {}

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