Logicmedium
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A student claims that 'If a number is divisible by 6, it is divisible by 3.' They then claim that 'If a number is not divisible by 3, it is not divisible by 6.' What logical principle allows this inference?
A student claims that 'If a number is divisible by 6, it is divisible by 3.' They then claim that 'If a number is not divisible by 3, it is not divisible by 6.' What logical principle allows this inference?