exam Maths Puzzle Numerical Ability

find the inverse
1 2 3
0 2 4
0 0 3

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exam Other Question

Hi, I sent a problem earlier- but it is VERY confusing as I accidently sent it and the spacing is NOT right. So I will try to attempt to send the problem in a different way.

Pro Simplify and evaluate:
(4^2x^3y^(-2)z^(-3)/x^(-5)y^8z^(-9))2