• 4212 · 1313916 · 4시간 전 · MS 2024

    1/2+1/4+1/8+...+1/2^21
    1/4+1/8+...+1/2^21
    1/8+...+1/2^21
    ...
    1/2^21

    1-1/2^21
    1/2-1/2^21
    ...
    1/2^20-1/2^21

    2(1-1/2^21)-21/2^21
    2-23/2^21