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##### Asked by: Doly Tristany

technology and computing artificial intelligence# How many rows are in a truth table?

Last Updated: 18th April, 2021

**truth table**of N inputs contains 2

^{N}

**rows**, one for each possible value of the inputs. Each

**row**in a

**truth table**is associated with a minterm that is TRUE for that

**row**.

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Besides, how many rows are in a truth table with 4 variables?

sixteen rows

Secondly, how many rows should an AND gate have in the truth table? Any **logic** block with n inputs will **have** a **row** in its Karnaugh mapping (formal name for **Truth Table**) for every possible combination of input states. That is, it will **have** 2^n **rows**.

Secondly, how many rows are there in 3 input gate truth table?

**There** is always at least one output column (on the right side) that represents the result of all possible combinations of the **inputs**. For Example: In the following **truth table there** are **3 input** columns, then we will have 2** ^{3}**= 8 combinations (8

**rows**).

How many rows are there in a truth table with n propositional variables?

Note that a **truth table** for a function of **N variables** has 2^**N rows**.