book Maths Puzzle Numerical Ability

factor the matrix A into a product of elementary matrices.

A= [1 1]
[2 1]

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book Other Question

simplify
(x^2ax^a+b) (x^2bx^b+c) (x^2cx^ca)
find the value of
5 X 10^-5
_____________
25 X 10^3