18. (Continued)

b. FG+(FG+H)

c. SR+(RT+RS)

d. (ST+Z)(AR)(RA)(Z+TS)

a. LM

19.

b. FG+H

c. SR+RT

d. (ST+Z)(AR)

Step by step

solutions on

LAW OF DOUBLE NEGATION: A = A

page A-2.

The diagram and truth table above represent the law of DOUBLE

NEGATION. Whenever two vincula of equal length extend over the

same variable or expression, both vincula may be removed by using

the DOUBLE NEGATIVE law. For example, A = A; CD = CD; A+B =

A+B; etc.

Simplify the following Boolean expressions, using the DOUBLE

NEGATIVE law.

a. X Y Z

c. (R+S) T

b. AB+X

d. L M T

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