exam Maths Puzzle Numerical Ability

im confused on how rto wokr this sequence out
0,14, 52, 126, 248
i have tried n cubed but cannot find the answer?

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exam Other Question

Using coordinate geometry, prove the the diagonals of a rhombus are perpendicular. Millie is 2/3 as old as maude. Six years from now millie will be 5/7 as old as maude will be. How old is each?