book Maths Puzzle Numerical Ability

1o balls numbered 1 to 10 are in a jar. Jack reaches into jar & randomly removes one of the ball. Then jill reaches into the jar & randomlly removes a different ball..What is the probability that the sum of the 2 numbers on the balls removed is even?

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The process of writing a quadratic equation in the form of (x+a)2=b is called? (The 2 on the outside of the paranthesis should be superscript for squared) hi everbody , thanks in advance for this wonderful website, my q is :
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