exam Maths Puzzle Numerical Ability

6 squareroot5/18 squareroot5/9 2squareroot9/20

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exam Other Question

infinity is the upper limit, n=1 is the lower limit.
3(1/4) to the n-1 power is the explicit.

how do i solve this? How to teach determining a value or r wo the line that passes through each pair of points has the given slope.
17 (6,3), (r,2, m=1/2