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Hybridization is based on the regions of electron density around the central atom. Because a triple bond and a single bond would mean that the carbon is bound to 2 atoms, it has sp hybridization because of the two regions. It would have 2 electrons in the sp orbital for 2 sigma bonds, and 2 unpaired electrons in the p-orbital for the two pi bonds.
Just to clarify some more, region of electron density are where a single/double/triple bond is or where a lone pair is. When deciding the hybridization of an atom, there should be one orbital (an s or a p or a d) for each region of electron density. An atom with a triple bond and one lone pair has two regions of electron density. Therefore, its hybridization would be sp (one orbital per region of electron density). An atom that is bonded to three other atoms and has no lone pairs would be spp, or sp^2. One orbital for each region of electron density present on the atom.
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