exam Maths Puzzle Numerical Ability

Find the sum of the first five terms of the series
1 + 8 + 64 + 512 + .......

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exam Other Question

Solve for x: 7/21 = x/24 Divide. Then simplify by taking roots, if possible. Assume that all expressions under radicals represent positive numbers.

sqrt ( 6a ) / sqrt ( 3a )