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1.26 . Give a bijection from the collection of all positive integers to the collection of...

1.26 . Give a bijection from the collection of all positive integers to the collection
of all rational numbers.

1.54. Gracefully estimate the probability that in 1000 flips of a fair coin the number
of heads will be at least 400 and no more than 600.

Math   Statistics-And-Probability   
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