Based on the law of syllogism, which conclusion can be drawn from the true conditional statements below?
If a number is a whole number, then it is an integer.
If a number is an integer, then it is a rational number.
If a number is a rational number, then it is a whole number.
If a number is a rational number, then it is an integer.
If a number is a whole number, then it is a rational number.
If a number is an integer, then it is not a whole number.