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##### Asked by: Doly Tristany

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

A

**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**.

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

sixteen rows

**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**).

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