Python Coding Challange - Question with Answer (01310725)

 

Understanding the Code

• s = 1: Initial value of s.

• range(1, 4) → iterates over i = 1, 2, 3.

The update in the loop is:

s = s + (i * s)

Which is the same as:

s *= (i + 1)

---

🔄 Step-by-step Execution

🧮 Iteration 1 (i = 1)

s = 1 + 1 * 1 = 2

🧮 Iteration 2 (i = 2)

s = 2 + 2 * 2 = 6

🧮 Iteration 3 (i = 3)

s = 6 + 3 * 6 = 24

---

✅ Final Output

print(s) → 24

---

🧠 Shortcut Insight:

You’re actually computing:

s *= (1 + 1) → s = 2  
s *= (2 + 1) → s = 6 
s *= (3 + 1) → s = 24

That’s 1 × 2 × 3 × 4 = 24, so it's calculating 4! (factorial of 4).

300 Days Python Coding Challenges with Explanation