exam Maths Puzzle Numerical Ability

a@b = a+(b+1)

is @ associative (use variable to prove)

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exam Other Question

Please help me with this problem, im stuck.

Factor completely.

4a^2 + 12ab + 9b^2 - 25c^2 7/3x-18 + 1-6x+24 how to find the lowest term by the steps