Comparing Expressions
Source:
February 11, 2009
Problem Statement
The expressions a\plus{}bc and (a\plus{}b)(a\plus{}c) are:
(A)\ \text{always equal} \qquad
(B)\ \text{never equal} \qquad
(C)\ \text{equal whenever }a\plus{}b\plus{}c\equal{}1 \\
(D)\ \text{equal when }a\plus{}b\plus{}c\equal{}0 \qquad
(E)\ \text{equal only when }a\equal{}b\equal{}c\equal{}0