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<p>[QUOTE=&quot;Numbers, post: 332961, member: 11668&quot;]Okay, after the discussion the other day on how often radars happen, I want to know <i>just how unusual</i> this thing is.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /></p><p><br /></p><p>Let&#039;s see...out of 100,000,000 serial numbers that are theoretically possible, the number of serials with no repeated digits would be 10*9*8*7*6*5*4*3, which works out to 1,814,400.</p><p><br /></p><p>In other words, 1.8% of all dollar bills have serial numbers with all different digits, or about 1 bill in every 55.&nbsp; By comparison, radar serials (which occur once in 10,000 bills) are almost 200 times scarcer.</p><p><br /></p><p>Oops...that didn&#039;t turn out to be as exciting as I thought.&nbsp; Math&#039;s a bummer sometimes, eh?&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie6" alt=":cool:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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