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Maths Puzzle
Numerical Ability
e(4,4)
f(4,-18)
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How many different 6-digit numbers can be written using all of the following digits: 2,5,5,6,6,6 ?
A scientist has to make 800ml of 61% sulfuric acid solution. He has available a one liter bottle of 40% sulfuric acid solution and a one liter bottle of 75% sulfuric acid solution.