Toggling of 100 switches..

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Question: Suppose there are 100 lights, which are all off. First round past them, turn all on; Second round past, turn every other off; Third round, turn every third on; vice verse; Ask the 100 round past, which light will be on? Solution: CLICK HERE POST YOUR OPINION IF YOU HAVE BETTER SOLUTION

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Question:
Suppose there are 100 lights, which are all off. First round past them, turn all on;
Second round past, turn every other off;
Third round, turn every third on;
vice verse;
Ask the 100 round past, which light will be on?

Solution:
CLICK HERE

POST YOUR OPINION IF YOU HAVE BETTER SOLUTION