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Question Number 71868 by naka3546 last updated on 21/Oct/19
Commented by prakash jain last updated on 21/Oct/19
f(n)=0
Commented by mr W last updated on 21/Oct/19
whatiff(f(n))=4n?
Commented by Cmr 237 last updated on 21/Oct/19
premierementtudoitpreciserquefestcroissante!nowwehaveprovethatf(1)=2andf(2)=3prove:supposonsquef(1)=k−ifk<2wehavef(1)<2⇒f(1)⩽1ief↘absurdecarf↗pardefinition.−ifk=3f(1)=3⇒f(f(1))=f(3)=3absurdecarf↗−ifk>3wehavef(f(1))=f(k)=3absurdecarf↗doncf(1)=2genalement,pour0<q<3kf(3k+q)=2×3k+qetf(2×3k+q)=3k+1+3q2019=2×36+561f(2019)=37+3×561=3870
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