38. AB + BK +AK

39. Derive a minterm expression from the SUM-output column

of the truth table below.

A

B

K

SUM

CARRY

0

0

0

0

0

0

0

1

1

0

0

1

0

1

0

0

1

1

0

1

1

0

0

1

0

1

0

1

0

1

1

1

0

0

1

1

1

1

1

1

40. Complete the truth table below.

a.

0

0

0

0

0

1

1

0

1

0

1

1

1

1

1

1

b. Is the expression X(X+Y) =X equivalent in all cases?

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