exam Maths Puzzle Numerical Ability

2x+3y=1
-3x+4y=-10

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exam Other Question

7P(n,3) = 6P(n+1,3)
Not sure why the answer is n=20. Can you help me out here? I have to divide this problem and leave the answer in exponent form. Assume that all variables in any denominator are nonzero...

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Number54

45a^4b^3 / 15a^4b^2

This is a fraction