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<!DOCTYPE html>
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<title>My Example</title>
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<p id="msg"></p>
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<p>Because <code>Math.random()</code> returns a floating-point number, we can multiply it, then use <code>Math.floor()</code> to return the largest integer less than or equal to the random number. This provides a more uniform distribution than using <code>Math.round()</code>.</p>
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<script>
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  document.getElementById("msg").innerHTML = Math.floor(Math.random( 1, 100 ) * 100);
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</script>