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Explain, please. The expression not(a-=15 and not b=-15) is equivalent to 1. not(a-15) or not(b-15) 2. a-15 and b-15 3.aorb-15 4. a!-15 orb-15

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Explain, please.

The expression not(a-=15 and not b=-15) is equivalent to 1. not(a-15) or not(b-15) 2. a-15 and b-15 3.aorb-15 4. a!-15 orb-15

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