book Maths Puzzle Numerical Ability

What is the least common multiple of p and s if the greatest common factor of p and s is 9?

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book Other Question

If f(x)=x^2-3x+5, find f(1)-f(4) 1 1 3
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t - 1 t + 2 t2</sup> + t-2</sup>
Please help me figure out this problem. I think it may have no solution.</PRE>