数学题1个袋中装有黑球、白球和红球共n(n∈N+)个,这些球除颜色外完全相同1个袋中装有黑球、白球和红球共n(n∈N+)个,这些球除颜色外完全相同.已知从袋中任意摸出1个球,得到黑球的概
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![数学题1个袋中装有黑球、白球和红球共n(n∈N+)个,这些球除颜色外完全相同1个袋中装有黑球、白球和红球共n(n∈N+)个,这些球除颜色外完全相同.已知从袋中任意摸出1个球,得到黑球的概](/uploads/image/z/5465296-64-6.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%981%E4%B8%AA%E8%A2%8B%E4%B8%AD%E8%A3%85%E6%9C%89%E9%BB%91%E7%90%83%E3%80%81%E7%99%BD%E7%90%83%E5%92%8C%E7%BA%A2%E7%90%83%E5%85%B1n%EF%BC%88n%E2%88%88N%2B%EF%BC%89%E4%B8%AA%2C%E8%BF%99%E4%BA%9B%E7%90%83%E9%99%A4%E9%A2%9C%E8%89%B2%E5%A4%96%E5%AE%8C%E5%85%A8%E7%9B%B8%E5%90%8C1%E4%B8%AA%E8%A2%8B%E4%B8%AD%E8%A3%85%E6%9C%89%E9%BB%91%E7%90%83%E3%80%81%E7%99%BD%E7%90%83%E5%92%8C%E7%BA%A2%E7%90%83%E5%85%B1n%EF%BC%88n%E2%88%88N%2B%EF%BC%89%E4%B8%AA%2C%E8%BF%99%E4%BA%9B%E7%90%83%E9%99%A4%E9%A2%9C%E8%89%B2%E5%A4%96%E5%AE%8C%E5%85%A8%E7%9B%B8%E5%90%8C.%E5%B7%B2%E7%9F%A5%E4%BB%8E%E8%A2%8B%E4%B8%AD%E4%BB%BB%E6%84%8F%E6%91%B8%E5%87%BA1%E4%B8%AA%E7%90%83%2C%E5%BE%97%E5%88%B0%E9%BB%91%E7%90%83%E7%9A%84%E6%A6%82)
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