Talk:2002 AIME I Problems/Problem 7

Is that really the expanded binomial theorem? --1=2 14:04, 29 April 2008 (UTC)

Its the extension of the binomial theorem for non-(positive integer) exponents, yes. (note that ${r\choose k}$ really is a polynomial in $r$, hence the result). Azjps (talk) 22:09, 29 April 2008 (UTC)
But look at the exponent in y. --1=2 13:09, 5 May 2008 (UTC)