a.

70.

A plot should be described with as few terms

as possible.

Each term should contain as few

variables as possible.

This is accomplished

by using one or more squares any number of

times in combination with one or more squares

not previously used to make groups of 4 or 2

squares.

In the diagram above, there are no

combinations of four potted squares.

The

plotted square in the upper right-hand corer

can be combined with the plotted square

directly beneath it to describe AC; it can

also be combined with the plotted square

immediately to the left to describe AB; and

it can be combined with the plotted square in

the upper left-hand comer to describe BC.

The simplest expression describing this plot

is

a.

ABC+AB+AC.

b.

AB+AC+BC.

c.

ABC+ABC+ABC+ABC.

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