Given F1 = \Sigma m(0, 4, 5, 6) and F2 = \Sigma m(0, 3, 6, 7) find the minterm expression
for F1 + F2 . State a general rule for finding the expression for F1 + F2 given the
minterm expansions for F1 and F2 . Prove your answer by using the general form of
the minterm expansion.