Electronics - Logic Gates - Discussion
Discussion Forum : Logic Gates - General Questions (Q.No. 7)
7.
How many truth table entries are necessary for a four-input circuit?
Discussion:
7 comments Page 1 of 1.
Deepthi C V said:
7 years ago
Thank you @Sundar.
Debasish said:
1 decade ago
It is similar to permutation with 4 sample.
Daniel Kamau said:
1 decade ago
We use the formula 2^n. In this case n=4 thus we get 2^4=16.
GANESHBABU said:
1 decade ago
Thank you sundar for your good explanation.
Sundar said:
1 decade ago
For 2 inputs: 2^2 = 4 truth table entries..
0 0
0 1
1 0
1 1
For 3 inputs: 2^3 = 2 x 2 x 2 = 8 truth table entries...
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Like the same, For 4 inputs: 2^4 = 2 x 2 x 2 x 2 = 16 entries required.
0 0 0 0
0 0 0 1
0 0 1 0
...
...
1 1 1 1
0 0
0 1
1 0
1 1
For 3 inputs: 2^3 = 2 x 2 x 2 = 8 truth table entries...
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Like the same, For 4 inputs: 2^4 = 2 x 2 x 2 x 2 = 16 entries required.
0 0 0 0
0 0 0 1
0 0 1 0
...
...
1 1 1 1
(1)
Mona said:
1 decade ago
How this answer is possible ?
ABDUL RASHEED said:
1 decade ago
FOR AN N-INPUT CIRCUIT WE NEED 2POWER(N) ENTRIES IN TRUTH TABLE.
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