Replacing loop with recursion

Tell us what’s happening:
Describe your issue in detail here.

 return multiply(arr, n - 1) * arr[n - 1];
please explain me this part why (arr, n - 1) * arr[n - 1]
  **Your code so far**

function sum(arr, n) {
// Only change code below this line
if(n <= 0)
return 0;
return sum(arr, n-1) + arr[n-1];
// Only change code above this line

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Challenge: Replace Loops using Recursion

Link to the challenge:

multiply(arr, n) == multiply(arr, n - 1) * arr[n - 1] is multiplying the first n elements of an array arr and returning the answer.

Now, to multiply the first n elements, we can multiply the first (n-1) elements and then multiply
the result with the nth element of the array.

So, multiply(arr, n) == multiply(arr, n - 1) * arr[n - 1].

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