Complete the class, Concatenate, like this:

1) Create a new variable V1 in which you append 60 to A.

2) Append 50 to V1.

3) If you didn't use the cat-operator before, use this to append 60 to A.

4) Append the set of 60 to B.

5) If you didn't use the cat-operator before, use this to append 60 to B.

6) Append the set of 18 to v, using the cat-operator.

Which are the results of your newly created variables?

The result is {50, 32, 60}

The result is {50, 32, 60, 50}

The result is {50, 32, 20}

The result is {{3}, {7}, {60}}

The result is {{3}, {7}, {20}}

The result is {4, 9, 7, 5, 2, 18}