exam Maths Puzzle Numerical Ability

How many ways can a president, vice president , and secretary be chosen from a club with only 3 members

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exam Other Question

Please tell me how to solve this equation below ASAP!

50 + 1.545 * 15/√n = 55 - 2.326 * 15/√n

Thank-you!!
Write as a sum or difference of logarithms of a and b. Assume that all variables represent positive real numbers.

log(6th root of ab over c^5)