book Maths Puzzle Numerical Ability

what is permutation? Find transversel sets?

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book Other Question

Simplify and then write in radical notation, if appropriate.

5/4 13/8
a b
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1/2 11/8
a b

a square root 5/4 b square root 13/8 divided by a 1/2 b sq is - 5/44 a solution to 4x=5/11?