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In c:

int fibr(int n) { // Find nth Fibonacci number using recursion.

if (n<=2) return 1; // the first two Fibonacci numbers are 1 and 1

return (fibr(n-2)+fibr(n-1));

}

int fibi(int n) { // Find nth Fibonacci number using iteration.

int temp,last=1,f=1;

int i;

for (i=3;i<n;++i) { // the first two Fibonacci numbers are 1 and 1

temp=f;

f+=last;

last=temp;

}

return f;

}

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