They're both perfectly natural and common. We often skip the second article when the two items may be thought of as a pair. The nut and bolt are rusted together.
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zenkg 1) The pencil and the eraser are on the table.
2)The pencil and eraser are on the table. As an aside, one would assume that the pencil and eraser are detached, which is perhaps not typical.
AvangiAs an aside, one would assume that the pencil and eraser are detached, which is perhaps not typical.I assumed they were detached.