The image contains a math question in Persian. It roughly translates to:

"A bag contains a set of 5 coins, among which 1 coin is real and the other 4 are counterfeit, and the counterfeit coins are lighter than the real one. What is the minimum number of weighings required to find the real coin using a balance scale?"

Options:

1. 2
2. 3
3. 4
4. 1

Solution:

To solve this, we need to think about the strategy of using a balance scale to identify the single real coin among 5 coins, where the fake coins are all lighter.

Step-by-step approach:

1. First Weighing: Divide the 5 coins into two groups: one group of 2 coins and another group of 2 coins, leaving 1 coin aside.
   • If