Determine the probability that a number randomly drawn from the row of Pascal's Triangle having precisely 128 numbers is divisible by the 127th number (reading left to right) in that row.

(In reply to re(2): 2 easy, we try harder-- who,what,why by Ady TZIDON)

127 being prime,all coefficients in the 128 th row,safe the first and the last, will be divisible by 127.

Hi Ady

I was not aware of this remarkable property of Pascals triangle, which I found fascinating. I worked through the first few coefficients, then it got late; I was very relieved to find when I next looked that there was such a handy short cut!

 

Posted by broll on 2010-05-16 03:02:30