In basic probability, which of the following values cannot be a probability?

• A. $1.2$
• B. $0.75$
• C. $0$
• D. $1$

Answer: (A)

Verified step by step guidance

1. Recall the fundamental property of probability values: a probability must be a number between 0 and 1, inclusive. This means the probability \( P \) satisfies \( 0 \leq P \leq 1 \).
2. Examine each given value to check if it lies within the interval \([0, 1]\).
3. The value \(1.2\) is greater than 1, which violates the rule that probabilities cannot exceed 1.
4. The values \(0.75\), \(0\), and \(1\) all lie within the acceptable range for probabilities.
5. Therefore, the value that cannot be a probability is the one that falls outside the range \([0, 1]\), which is \(1.2\).