Solving Boolean Algebra: a'b'c' + abc = 1?

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SUMMARY

The Boolean expression a'b'c' + abc = 1 is not universally valid; it holds true only when the values of a, b, and c are identical. The alternative expression (abc)' + abc = 1 demonstrates that the two terms cover all possible outcomes of the variable combinations, resulting in a definitive truth. Constructing a truth table with variables a, b, c, a', b', and c' confirms this conclusion, revealing that the original expression fails when a, b, and c differ.

PREREQUISITES
  • Understanding of Boolean algebra concepts
  • Familiarity with truth tables
  • Knowledge of logical operators (AND, OR, NOT)
  • Basic skills in algebraic manipulation
NEXT STEPS
  • Research how to construct truth tables for complex Boolean expressions
  • Learn about simplification techniques in Boolean algebra
  • Explore the application of Boolean algebra in digital circuit design
  • Study the laws of Boolean algebra, including De Morgan's Theorems
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Students and professionals in computer science, electrical engineering, and anyone interested in digital logic design and Boolean algebra applications.

killerfish
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Hi guys,

I'm new to boolean algebra, i couldn't get this through...

a'b'c' + abc = 1 ? or i have to use (abc)' + abc = 1 to get 1 ?

Thanks you.
 
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(abc)' + abc = 1. There are only 2 possible values for abc, and they are 0 and 1. So it is very obvious that if abc isn't 1, then (abc)' is, and vice versa. So 1 or 0 = 1, 0 or 1 = 1. To prove that a'b'c' + abc = 1 isn't always necessarily true, you can construct a truth table with a b c a' b' c' and your answer. You will find that statement is only true when a,b,c are all the same value.
 

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