exam Maths Puzzle Numerical Ability

Variables using

input output
1 -> 3
2 -> 5
3 -> 9
4 -> 17
5 -> 33

How do you get the answer?</PRE>

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exam Other Question

"how do you answer these quistions i do not get it?" how can i learn how to do this is a easy way i have a test in two weeks and i just can't get the =0 thing can you please help me? if this is really free.