exam Maths Puzzle Numerical Ability

If you labled a ray points CD or DC, are they the same?

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exam Other Question

Find the equation of the ellipse with vertices (5,1) and (-3,1) and foci (3,1) and (-1,1).
Someone please help!! Hi. Can you please solve this question and please let me know what is the way to arrive at the solution. Find X where X is,
X = [(1/11) + (1/12) + (1/13) + ........ + (1/20)]