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2013 AMC 10BProblem 4P1-10~2 minPrint
Number PropertiesBasic CountingSet up the equation/formula and compute; no special trick needed

When counting from 33 to 201201 , 5353 is the 51st51^\mathrm{st} number counted. When counting backwards from 201201 to 33 , 5353 is the nthn^\mathrm{th} number counted. What is nn ?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.