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Find the sum of triangular BO(3) unit an...

Find the sum of triangular `BO_(3)` unit and `BO_(4)` tetrahedral unit in borax.
[If your answer is `6 BO_(3)` unit and `3 BO_(4)` unit then write 6+3=9]

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The correct Answer is:
4
`sp^(2)rarr2,sp^(3)rarr2`
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