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In a grade 5 classroom the numbers 1 to 100 are written on the chalkboard....

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In a grade 5 classroom the numbers 1 to 100 are written on the chalkboard. The teacher circles 10 numbers at random. What is the expected number of prime numbers that will be circled by the teacher?5 prime numbers7.5 prime numbers10 prime numbers2.5 prime numbers

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