Question: A commercial for Glade Plug-ins says that by inserting 2 of a choice of 11 scents into the device, you can make more than 50

A commercial for Glade Plug-ins says that by inserting 2 of a choice of 11 scents into the device, you can make more than 50 combinations. If we exclude the boring choice of two of the same scent, how many possibilities are there?

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