11C22 ? 1C11 ? 1C10
This is a question of permutations and combinations. Solve it.
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Your question is not clear and appears to be incomplete as the symbol for "?" is unclear. Recheck your question or please be a little specific about the name of the chapter/textbook to which you are referring here so that we can provide you with some meaningful help.
Look forward to hearing from you again!
Regards