exam Maths Puzzle Numerical Ability

Hey,
I am having a bit of trouble setting out proofs in geometry.
I'm fine with proving if two triangles are congruent using tests like SSS (3 equal sides) SAS (2 equal sides and

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exam Other Question
729 1/3 1)What is the inverse element of 7 under the binary operation "X" defined on the set of real numbers.
2)The binary operation * is defined on the set {0,1,2,3} as a^2-b^2+ab. Find