How many times should Karel turn left in order to turn right?

Karel should turn left 3 times to effectively turn right.

Here’s the reasoning: When Karel turns left, he rotates 90 degrees in that direction. To turn right, he needs to turn the opposite direction. Therefore, if Karel turns left three times, he completes a 270-degree turn, which results in a right turn.

If you have any more questions or need further assistance, feel free to ask!