exam Maths Puzzle Numerical Ability

solve using augmented matrices
2x+y+z=0
3x-2y-3z=-21
4x+5y+3z=-2

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exam Other Question

x+2y=10
3x-y=2 Jasmine says that there are 362,880 distinguishable permutations of the letters in the word TEXTBOOKS. Do you agree? Justify your answer.