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A direct biconditional proof demonstrating that a three-digit number is divisible by 9 if and only if the sum of its digits is divisible by 9.
Extension-2
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A guided proof demonstrating that the orbit of an irrational rotation is dense using the Pigeonhole Principle, and proving that there exists a power of 2 starting with 2025.- Published on
A challenging HSC Extension 2 Mathematics problem exploring the evaluation of sequence limits using inequalities and the Squeeze Theorem.