exam Maths Puzzle Numerical Ability

hey i would really appreciate it if you could solve this combinatorics problem for me:
P(n,3)= 2C(n,2), nϵN.

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exam Other Question
Find all positive values for k for which each of the following can be factored,



x^2+x-k

??? Write the ratio of 10 1/2 to 25 1/5 as a fraction in simplified form.