Is this the right place to say that there is something wrong about them?

19. Which of the following cannot be used to test if a variable is any of 1, 2, 3, or 4?

1. If sum(A={1,2,3,4

2. If (A=int(A))(A>=1)(A<=4)

3. If A={1,2,3,4}

4. If A(int(A)=A)(A<5)Answer:If A={1,2,3,4} because the If command does not work with lists.

The fourth one also says true if the variable is negative

23. True or False: The following is an alternative to using the and operator.

:If Anot(B

Answer:True. Remember that multiplication is implicitly done on the TI-83 calculators.

That's no AND operation to me… Or did they mean and operation between A and not(B)? If so a better question would be 'is the following a good alternative for 'If A And not(B' ?