exam Maths Puzzle Numerical Ability

This is my question--From an urn containing 7 red and 4 green balls, in how many ways can we draw a set of 5 balls of which 3 are red and 2 are green?

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sqrt6xy^3 over sqrt3x
An isosceles right triangle is removed from each corner of a square piece of paper so that a rectangle remains. What is the lenght of a diagonal of the rectangle if the sum of the areas of the cut-off pieces is 200?