You have 9 identical balls. One is slightly heavier. What is the MINIMUM weighings needed to find it using a balance scale?
A
4
B
3
C
2
D
1
💡 Correct Answer:
2
ℹ️ Explanation:
Split into 3 groups of 3. Weigh group 1 vs 2. If equal, heavy one is in group 3; else it's in the heavier group. Then from 3 balls: weigh 2 of them. 2 weighings total.