exam Maths Puzzle Numerical Ability

please help me simplify if possible and if it cant be simplified say "not possible" (A) sqrt(3) (sqrt (6) - 2 sqrt(3)) (A)____________
(B) sqrt(18) - sqrt(3) / sqrt (6) (B)____________

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exam Other Question
How many three digit numbers can be formed using the digits 1,2,3,4,5,6 and 7 if no digit can be replaced in a number? I have a slight Idea on how to do this but I get stuck every solve the system by addition 2x + 4y = 3
4x -2y =1

Thank you in advance