Determination of Prime Implicants

AB’CD’ + AB’CD = AB’C

1 0 1 0 + 1 0 1 1 = 1 0 1 -

(The dash indicates a missing variable)

A’BC’D + A’BCD’

0 1 0 1 + 0 1 1 0

We can combine the minterms above because they

differ by a single bit.

The minterms below won’t combine