Shopkeeper's Weights

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.




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The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

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John bought 150 chocolates but he misplaced some of them. His Father asked him how many chocolates were misplaced.
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If you count in threes, two remain
If you count in fours, three remain
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