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Steven is an incoming college freshman and is selecting his courses for the semester. He estimates the following probabilities: the probability of taking Calculus is

Steven is an incoming college freshman and is selecting his courses for the semester. He estimates the following probabilities:

the probability of taking Calculus is 0.70

the probability of taking Biology is 0.15

the probability of taking both Calculus and Biology is 0.05

Please round each answer to two decimals.

(a) What is the probability that he takes at least one of these courses?

(b) What is the probability that he does not take either of these courses?

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