What value does function sum return when called with a value of 5?

```
int sum (int n) {
if (n < 1) return 1;
else return n + sum(n - 1) + sum(n - 2);
}
```

We have to find the value of sum(1), sum(2), sum(3), sum(4) and sum(5) sum(1) = 1 + sum(0) + sum(-1) = 1 + 1 + 1 = 3 sum(2) = 2 + sum(1) + sum(0) = 2 + 3 + 1 = 6 sum(3) = 3 + sum(2) + sum(1) = 3 + 6 + 3 = 12 sum(4) = 4 + sum(3) + sum(2) = 4 + 12 + 6 = 22 sum(5) = 5 + sum(4) + sum(3) = 5 + 22 + 12 = 39 So,39is the answer

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