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Message: <blockquote data-quote="Ecko" data-source="post: 375427" data-attributes="member: 24874">Your method is 33.33% chance for any. The way [USER=9520]@Wess[/USER] described would be how you get the proper odds:[php]<?php$rand = rand(1, 100);$amount = array("50", "100", "250");if($rand <= '70') {echo "You win $amount[0]";} elseif ($rand > '70' && $rand < '90') {    echo "You win $amount[1]";} else {    echo "You win $amount[2]";}[/php]Don't mind the sloppiness, I did it using nano. I also ran this from shell 100 times and recorded results:[code]for (( i=0; i<100; i++ )); do php rand.php >> rand.txt; echo $'\r' >> rand.txt & done[/code]Results: <a href="http://pastebin.com/raw/akhAx2Lv" target="_blank">http://pastebin.com/raw/akhAx2Lv</a></blockquote>