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Browse the official answer keys for every Big Challenge contest. Pick a year, then a format if more than one was available.

1
Step 1

Choose a year

2026 View answer keys 2025 View answer keys 2024 View answer keys 2023 View answer keys 2022 View answer keys 2021 View answer keys 2020 View answer keys 2019 View answer keys 2018 View answer keys 2017 View answer keys
2
Step 2

Choose a format

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