If A is an integer, which of the following CANNOT be inferred from the statement above?

Question

• If A is a multiple of 5, then a is a multiple of 10.
• If A is not a multiple of 5, then a is not a multiple of 10.
• A necessary condition for A to be a multiple of 10 is that A is a multiple of 5.
• A is multiple of 10 implies that a is a multiple of 5.

Answer 1

If A is a multiple of 5, then a is a multiple of 10.