exam Maths Puzzle Numerical Ability

What three consecutive numbers who sum is 0

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exam Other Question

What is the common difference between successive terms of the sequence generated by tn=-1/3n+1/2? Can someone show me an example to help me understand this? I know the answer is -1 How many cubes with a 2 cm edge can be packed in this box 10 cm length , 4 cm width, 6 cm height