book Maths Puzzle Numerical Ability

evaluate the 3 x 3 determinant

3 4 -1

4 6 2

8 -2 3

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book Other Question

Two trains are traveling to the same city. The second train has to travel 264 miles in the same time the first train travels 228 miles. If the second train's rate of travel is 6 Let T be a linear operator in V. Prove that T^2 = 0 if and only if the range T is a subset of null T.