exam Maths Puzzle Numerical Ability

(4|5-3|2)(2|5+4|2) im stuck on this problem and need some help thanks

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exam Other Question

Solve for R1:

1/F = (n-1)(1/R1-1/R2)
Please show me how to solve. Thanks!

(X - 3) (2X 3 - 15X - 6)