Python Coding Challange - Question With Answer(01090425)

 

This is a recursive function. It calculates the sum of all numbers from 1 to num.

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 How does recursion work here?

Let's see how sum(5) gets evaluated:

1. sum(5) → 5 + sum(4)

2. sum(4) → 4 + sum(3)

3. sum(3) → 3 + sum(2)

4. sum(2) → 2 + sum(1)

5. sum(1) → returns 1 (base case)

Now plug values back in:

• sum(2) = 2 + 1 = 3

• sum(3) = 3 + 3 = 6

• sum(4) = 4 + 6 = 10

• sum(5) = 5 + 10 = 15

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✅ Output:

15

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In Simple Words:

This function adds:

5 + 4 + 3 + 2 + 1 = 15


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