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There are 1000 doors that are of the open-close type. When a person opens the door he closes it and then opens the other. When the first person goes he opens-closes the doors ion the multiples of 1 i.e., he opens and closes all the doors. When the second goes he opens and closes the doors 2, 4 6 8 rely. Similarly when the third one goes he does this for 3 6 9 12 15th doors rely. Find number of doors that are open at last.
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In the series 0, 3, 8, 15,__ What is the next number?
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In the word ECONOMETRICS, if the first and second , third and forth ,forth and fifth, fifth and sixth words are interchanged up to the last letter, what would be the tenth letter from right?