Difference between revisions of "2000 AMC 10 Problems/Problem 12"

(New page: We have a recursion: <math>A_n=A_{n-1}+4(n-1)</math>. I.E. we add increasing multiples of <math>4</math> each time we go up a figure. So, to go from Figure 0 to 100, we add <math>4 \cd...)
 
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We have a recursion:
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#REDIRECT [[2000 AMC 12 Problems/Problem 8]]
 
 
<math>A_n=A_{n-1}+4(n-1)</math>.
 
 
 
I.E. we add increasing multiples of <math>4</math> each time we go up a figure.
 
 
 
So, to go from Figure 0 to 100, we add
 
 
 
<math>4 \cdot 1+4 \cdot 2+...+4 \cdot 99=4 \cdot 4950=19800</math>.
 
 
 
 
 
<math>19801</math>
 
 
 
B.
 

Latest revision as of 23:46, 26 November 2011