1964 AHSME Problems/Problem 31
Revision as of 17:49, 5 March 2014 by Bobthesmartypants (talk | contribs) (Created page with "Let <cmath>f(n)=\dfrac{5+3\sqrt{5}}{10}\left(\dfrac{1+\sqrt{5}}{2}\right)^n+\dfrac{5-3\sqrt{5}}{10}\left(\dfrac{1-\sqrt{5}}{2}\right)^n.</cmath> Then <math>f(n+1)-f(n-1)</math>,...")
Let
Then , expressed in terms of
, equals: