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Monday, May 24, 2010

Is the switch On or Off ?

Let there be n numbered switches. Suppose scientist Dalton operated 1st switch for 1 time, 2nd for 2 times, 3rd for 3 times.........................thus he operated n th switch for n times. If a switch gets Off from On, then the next switch is operated automatically.

If all the switches were Off at first,
Then how many switches were On at last?


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