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🟦🟦🟦🟩🟩🟩🟩🟩🟩🟩🟦🟦🟦🟦🟦
🟦🟦🟩🟩🟩⬜⬜⬜⬜⬜🟩🟦🟦🟦🟦
🟥🟩🟩🟩⬜⬜⬛⬜⬛⬜⬜🟦🟦🟦🟦
🟦🟦🟦🟦⬜⬜⬜🟧⬜⬜⬜🟦🟫🟦🟦
🟦🟦🟫🟦⬜⬜⬜⬜⬜⬜⬜🟦🟫🟫🟦
🟦🟫🟫🟦🟩🟥🟩🟥🟩🟥🟦🟦🟫🟦🟦
🟦🟦🟫🟦🟩🟥🟩🟥🟩🟥🟦🟫🟫🟦🟦
🟦🟦🟫🟫🟥🟥⬜⬜⬜⬜⬜🟫🟦🟦🟦
🟦🟦🟦⬜🟩🟩⬜⬛⬜⬜⬜⬜🟦🟦🟦
🟦🟦🟦⬜🟥🟥⬜⬜⬜⬜⬜⬜🟦🟦🟦
🟦🟦🟦⬜⬜⬜⬜⬛⬜⬜⬜⬜🟦🟦🟦
🟦🟦🟦🟦⬜⬜⬜⬜⬜⬜⬜🟦🟦🟦🟦
🟦🟦🟦🟦🟦⬜⬜⬜⬜⬜🟦🟦🟦🟦🟦
🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦
ℋ𝒶𝓋𝑒 𝒶 𝓇𝑒𝓁𝒶𝓍𝒾𝓃𝑔 𝓌𝑒𝑒𝓀
🟪🟪🟪🟪🟪🟪🟥🟥🟪🟪🟪🟪🟪🟪
🟪🟪🟪🟪🟪🟪🟥🟥🟥🟪🟪🟪🟪🟪
🟪🟪🟪🟪🟪⬜⬜⬜⬜🟪🟪🟪🟪🟪
🟪🟪🟪🟪⬜⬛⬜🟨🟨⬛🟪🟪🟪🟪
🟪🟪🟪🟪⬜⬜⬜🟥🟥⬜🟪🟪🟪🟪
🟪🟪🟪⬜⬜⬜⬜⬜⬜⬜⬜🟪🟪🟪
🟪🟪⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜🟪🟪
🟪🟪⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜🟪🟪
🟪🟪🟪⬜⬜⬜⬜⬜⬜⬜⬜🟪🟪🟪
🟪🟪🟫🟨🟨🟨🟨🟨🟨🟨🟨🟫🟪🟪
🟪🟪🟪🟪🟪🟪🟪🟪🟪🟪🟪🟪🟪🟪
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ℍ𝕒𝕧𝕖 𝕒 𝕟𝕚𝕔𝕖 𝕨𝕖𝕖𝕜
ᴴᵉˡᵖ!
𒆜 ɦǟʋɛ ǟ աօռɖɛʀʄʊʟ աɛɛӄɛռɖ 𒆜
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🎃█───███───█ 🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃
🎃████▀─▀████▐─█▐██▐─▐─▐██ ▀█▐▐▐▀▐▀▐█▐🎃🎃
🎃█▄▀▀▀▀▀▀▀▄█▐▀█▐▄█▐─▐─▐─█ ─█▐▐▐▀▐▀▐▐█🎃🎃
🎃─▀█▄▄▄▄▄█▀─▐─█▐─█▐▄▐▄▐▄█ ─███▐▄▐▄▐─█🎃🎃
🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃
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⠀ 𝐇𝐚𝐯𝐞 𝐚 𝐥𝐨𝐯𝐞𝐥𝐲 𝐝𝐚𝐲
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n(n 1)/2
Prove:
1 2 3 ... n = n(n 1)/2
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⠀⠀:
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⠀ 𝐇𝐚𝐯𝐞 𝐚 𝐥𝐨𝐯𝐞𝐥𝐲 𝐝𝐚𝐲
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ℌ𝔞𝔳𝔢 𝔞 𝔩𝔬𝔳𝔢𝔩𝔶 𝔡𝔞𝔶