Elitmus Exam Numerical Ability Arithmetic

f(n) is a function...where f(f(n))+f(n)=2n+3. f(0)=1;find f(2012)

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Elitmus Other Question

A finishes a work in 8 hrs,B finishes a work in 10 hrs,C finishes a work in 12 hrs.A,B,C work together but A leaves after 2 hrs find the time t taken by B & C? In how many ways you can form a sandwich from yellow,blue,white,red color such that no two adjacent color are same.