Difference between revisions of "2018 AMC 10B Problems/Problem 20"
(Created page with "A function <math>f</math> is defined recursively by <math>f(1)=f(2)=1</math> and <cmath>f(n)=f(n-1)-f(n-2)+n</cmath>for all integers <math>n \geq 3</math>. What is <math>f(201...") |
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Revision as of 15:14, 16 February 2018
A function is defined recursively by and for all integers . What is ?