Sub-topic 1
2024 · National One-Eighth
Free
Riddles identifying pascal's triangle from its properties
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Sub-topic 2
2023 · National One-Eighth
Premium
Riddle: the binomial and its theorem
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Sub-topic 3
2018 · National Preliminary
Premium
Third term in the expansion of $(1+2x)^5$ in ascending powers of $x$
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