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Prove the following conjectures. For all positive integers x, y and z, if y is divisible by x and z is divisible by x, then 1. y + z is divisible by...
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Prove the following conjectures. For all positive integers x, y and

z, if y is divisible by x and z is divisible by x, then 1. y + z is divisible by x. 2. y z is divisible by x.

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