<p>ok, someone please help me with this math problem. If there are 40 kids in my class, what is the probability that 2 have the same birthday? (please show me how you did this)</p>
<p>89.1%</p>
<p>[Wikipedia’s</a> explanation](<a href=“http://en.wikipedia.org/wiki/Birthday_paradox]Wikipedia’s”>Birthday problem - Wikipedia)
[Ask</a> Dr. Math explanation](<a href=“Classroom Resources - National Council of Teachers of Mathematics”>Classroom Resources - National Council of Teachers of Mathematics)</p>
<p>(Just FYI to anyone else reading - this is definately not a SAT-level problem)</p>
<p>Unless you are in AP statistics, don’t worry about this problem! :D</p>