- Published on
A medium difficulty HSC math problem on contradiction with a + b <= 5 with full step-by-step solutions.
Medium
- Published on
A medium difficulty HSC math problem on cubic sums bound a quartic term with full step-by-step solutions.- Published on
A medium difficulty HSC math problem on difference of squares cannot equal 1 with full step-by-step solutions.- Published on
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.- Published on
A medium difficulty HSC math problem on divisibility by 9 via digit sum with full step-by-step solutions.