Question

There are 100 lockers in a room each of these lockers can be either opened or closed. Initially all lockers are closed. Man 1 goes and changes the state of all lockers that are multiples of 1. Man 2 goes and changes the state of all lockers that are multiples of 2. Man 3 goes and changes the state of all lockers that are multiples of 3 and so on till man 100 goes and changes the state of all lockers that are muliples of 100. In the end how many lockers are opened.
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Answer 1

Answer:

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