The probability of drawing a ball with an even number from an urn with 100 numbered balls is 1/2.
Probability of drawing a number: In a urn containing 100 balls numbered from 1 to 100, the total possible outcomes are 100. For drawing a number that is even (par), we consider the numbers from 1 to 100 that are divisible by 2, which are the even numbers. There are 50 even numbers from 1 to 100. Therefore, the probability of drawing a ball with an even number is 50/100 or 1/2.
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