Two quantities, \(\left( x+1 \right)\) and \((y-2)\) are in inverse proportion. Values of \(x\) and \(y\) are shown in the table below.
| \(x\) | \(1\) | \(3\) | \(b\) |
|---|---|---|---|
| \(y\) | \(10\) | \(a\) | \(30\) |
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