Bug in C++ for loop lesson?

Question

I'm trying to learn C++ but on the for loop lesson there seems to be a bug.
On the question, Fill in the blanks to print EVEN (multiples of 2) values from 0 to 20 using a for loop:

The answers should be ;,20,2, and x, which works properly in an IDE, but it keeps telling me I'm wrong.

Answer 1

The answers are:
;
20;
2
x

Answer 2

Ishan Swali looks like you're missing the semicolon after 20 for the second blank. See dimitris kapoulas answer as it is correct.

Answer 3

just had a look at that particular module, did the three "test" and they where fine.
Did you miss the semi-colon after the 20?

Answer 4

I had it when entering.... i logged out and back in again and it worked.... weird

Answer 5

I don't understand your problem!! Can you explain it better?

Answer 6

one of the questions within the learn C++ keeps marking an answer thats right wrong and wont let me move on