题目内容

假设有十只同种电器元件，其中有两种是不合格品，装配仪器时，从这批元件中任取10只，如果是不合格品，就扔掉重新任取一只；如仍是不合格品，就继续任取，试求在渠道合格品之前，已取出的不合格品只数的期望。

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