1 If the TV is on sale I will buy the TV The TV is not on sa

1)         If the TV is on sale, I will buy the TV.

            The TV is not on sale.

            I will not buy the TV.

2)         If the TV is on sale or I can finance it, I will buy the TV.

            I cannot finance the TV.

            I will not buy the TV.

3)         The TV is not on sale or I will buy it.

            The TV is on sale.

            I will buy the TV.

Solution

1) If the TV is on sale, I will buy the TV.

The TV is not on sale.

I will not buy the TV.

This is not valid because it does not say anything about the condition when TV is not on sale. It just talks about when TV is on sale. So, we cannot say anything about what will happen when TV is not on sale.

2)         If the TV is on sale or I can finance it, I will buy the TV.

            I cannot finance the TV.

            I will not buy the TV.

This argument is also not valid because here it says I cannot finance the TV but it does not tell anything about whether TV is on sale or not. If it\'s on sale, I can buy it and if not then I can\'t. Therefore, this argument is not valid.

3)         The TV is not on sale or I will buy it.

            The TV is on sale.

            I will buy the TV.

This argument is valid because it says that either TV is not on sale or I will buy it.

This means If TV is not on sale then I will not buy it or If TV is on sale then I wil buy it.

Therefore, This argument is valid as TV is on sale so I will buy it.