book Maths Puzzle Numerical Ability

the range of f(x)=log2x is ?

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There is a question on an assignment it is:

How many three letter words can be formed with the word MANAGEMENT? The letters do not have to be real words, just any three letters I have a 20 m x 40 x area. I want to fill it with sand to the depth of 3 inches. How many tonnes of sand will I require?