PUZZLE 6:100 LIGHT BULBS
There are 100 light bulbs in a room numbered as 1,2,...100 and are currently switched off.Each bulb has its own switch.There are 100 persons numbered as same(1,2,...100).
Person No.1 enters the room and switched on every bulb,then person 2 enters and switched off bubs(2,4,6,8,...)(changed state of bulbs).Then person No.3 enters and changed the state of bulbs numbered 3,6,9,....This continues upto all 100 persons.
At last how many bulbs are switched on?
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