Use Randomized Numbers

You can use the WebAssign randnum() function in your questions to generate randomized integer values within a specified range. If needed, you can use the randomized integer values to compute decimal or fractional values.

How-ToInstructor HelpWebAssign

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In an <EQN> or <eqn> tag, use the randnum() function to generate a randomized integer.
If needed, calculate a decimal or fractional value using the randomized integer.

Use the following syntax:
```
randnum(low, high, increment, exclude)
```
where:
- low and high are integers defining the smallest and greatest values to be returned by the function.
- increment is a natural number defining the interval of values to be returned between low and high.
- exclude is an optional single value that should not be returned. One reason to use this is to prevent a problem from using the same values as an example in the textbook.
  Ensure that the value you are excluding is one that might otherwise be returned. For example, in the following code, $a is never excluded because $a is one of (1,3,5,7,9) and $b can never be any of those values.
```
$a = randnum(1,9,2);
$b = randnum(2,10,2,$a);
```
For example:
```
# an integer between 1 and 8:
$a = randnum(1,8,1);

# an even number between 20 and 50:
$b = randnum(20,50,2);

# an integer between 1 and 9 ≠ $a:
$c = randnum(1,9,1,$a);

# a multiple of 0.25 between 1.50 and 2.50:
$d = decform(randnum(150,250,25)/100,2)

# a multiple of 1/6 between 3 and 4, as a reduced
# fraction (3, 19/6, 10/3, 7/2, 11/3, 23/6, 4):
$e = fraction(randnum(18,24,1),6)
```

Example Numerical Question With Randomized Values The following table summarizes an actual question. QID 1870653 Name Template2 numerical_randomization Mode Numerical Question <eqn> $minutes = randnum(3,8,1); $mph = randnum(30,90,6,60); $mpm = $mph / 60; $distance = $mpm * $minutes; '' </eqn> How many miles will a car travel in <eqn $minutes> minutes if its speed is constant at <eqn $mph> mph? <br> <_> miles Answer <EQN $size=2; $distance> Solution Since there are 60 minutes/hour, at <eqn $mph> mph the car is traveling at <eqn $mpm> miles/minute. Display to Students