Elitmus Exam Numerical Ability Data Interpretation

In how many ways you can form a sandwich from yellow,blue,white,red color such that no two adjacent color are same.

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Elitmus Other Question

f(n) is a function...where f(f(n))+f(n)=2n+3. f(0)=1;find f(2012) A year ago,Mohit was four time his son"s age.In six years,his age will be 9 more than twice his son age.what is the present age of son?