exam Maths Puzzle Numerical Ability

23/15 (logBASE5 N+logBASE5 (n+11)) -12/13 logBASE5(n-10) Condense to the logarithm of a single quantity.

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Solve: 7x6-2=9x6-3

Thanks using the geometric sequence of numbers 1,1/2,1/4,1/8... to find the following..What is r, the ratio between 2 consecutive terms? show work

using the formula for the sum of the