Maths Maths Puzzle Numerical Ability Algebra

if f(f(n)) + f(n) =2n+3
and f(0)=1
f(2012)=?

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Maths Other Question

What is the next number of the following sequence
18, 17, 22, 12, 15, 23, 41, 21, ?
is there any chance that accenture will call again through elitmus