KEAM 2015 Math Paper

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Question : 23 of 120
 
Marks: +1, -0
If f(l)=1,f(2n)=f(n) and f(2n+1)=(f(n))2−2 for n=1,2,3,..., then the value of f(l)+f(2)+...+f(25) is equal to
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