book Maths Puzzle Numerical Ability

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Add. 3/x + 2 - x/x - 3


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0.5x + 0.6y = 5.4
Let Pn[X] be the vector space of all polynomials of degree <=n, prove that the set (1,x,x(x-1),x(x-1)(x-2),...,x(x-1)(x-2)***(x-n+1)) is a basis for this vector space.

i know th