[問題] excel問題
最近碰到一個需要用excel處理的問題 但不知該如何下手
題目是 有一個籤筒 內有十支籤 中獎1支 沒中9支 沒中時累積紅利5點（中獎後不歸0）
當累計100點時送出獎品 試問要得到9次獎品約要抽幾次
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