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var guess = 0; function randomNum( lower, upper ) { var guess1 = prompt ("I am thinking of a number between" lower " & " upper " what is it?"); var random = math.floor(math.random() * (upper - lower+ 1)) + lower; return random; guess += 1; if parseInt(guess1) === parseInt(randomNum) { document.write('<p> You guessed it! <p>'); alert("Ok lets do it one more time!"); } else { alert("Try again!"); } }; randomNum( 10, 20 );

not line three, but in the prompt to user... var guess1 = prompt ("i am thinking of a number between" lower "&" upper "what is it?");

Hey Tyler,

It looks like the error you're you're getting has to do with the string passed into prompt the function. To combine strings with variables, you'll want to use the + operator.

Here's an example:

```var guess1 = prompt ("I am thinking of a number between " + lower + " & " + upper + " what is it?");
```

Another way you could create the string is by using something called template literals. This is what your same code would look like using template literals:

```var guess1 = prompt (`I am thinking of a number between \${lower} & \${upper} what is it?`);
```

One other thing I noticed when testing your code is that you'll want to add an opening and closing brace around your if statement, like this:

```if (parseInt(guess1) === parseInt(randomNum))
```

Hope that helps!

-Brandon