Interview Maths Puzzle Numerical Ability

there are sticks of length 1,2,3...10.we need to join them.Cost for joining x length stick with y length=(x+y).Find the total cost of joining these sticks.

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Interview Other Question

how many cubes of 1 cm side can be made from a cube of 8 cm side find the next number of the series 2,3,5,16,231,-