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2012

1) If a pulley with a diameter of 35cm is used to get water from a well of depth 33 meters, how many number of rotations of the pulley is required to get the water from the well?

2) A teacher asked a student to calculate the average of 4 numbers. The student wrongly hears +6 as -6, and calculates the average of 4.5. What should have been the correct average?

3) What is the sum of the following series? 1 + 7 + 17 + ... + 511(nth term is 2 * n^2 -1 )

4) What is the 5 th prime number ? (2 is the 1st prime, 3 is the 2nd and so on)