exam Maths Puzzle Numerical Ability

A= [2 -1] B= [4 -2]
[3 0] [5 1]

Find 3A-B.

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exam Other Question

x/2-2(x-3) > 1 If the deforestation of El Salvador continues at the current rate for 20 more years only 53% of the present forests will be left. If the decline of the forests is exponential, what