exam Maths Puzzle Numerical Ability

if 18c2r=153*13c2r-5 what is the value of r?

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exam Other Question

A company has 2 machines that produce widgets. An older machine produces 23% defective widgets, while the new machine produces only 8% defective widgets. In addition, the new mac if f(t)=2t^2 -4t - 1 find f(2) F(-1)