Find the Missing Operator in 20?1=20: Basic Equation Solving

To solve this problem, we'll evaluate each mathematical operation:

• Addition ($+$): $20 + 1 = 21$, which is not equal to 20.
• Subtraction ($-$): $20 - 1 = 19$, which is not equal to 20.
• Multiplication ($\times$): $20 \times 1 = 20$, which is equal to 20.
• Division ($\div$): $20 \div 1 = 20$, which is equal to 20.

Both multiplication and division by 1 result in the number 20. Therefore, both operations maintain the equality.
However, based on the given choices, the operation that is likely represented by $\text{?}$ is division, i.e., $:$.

Therefore, the correct sign that completes the equation $20 \text{?} 1 = 20$ is $:$.