exam Maths Puzzle Numerical Ability

11<3x+2<20

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Let A be an nxn normal matrix with nonzero eigenvalues k1, k2, ... , kr and corresponding eigenvectors x1, x2, ... , xr where r is less than or equal to n. Show that b is in the s I have 4 numbers: 2/3, 5/8, 6, 6. I can only use those numbers and I can not make them into decimals. I need to make 24. How can I do this?