ഒരു ക്യൂ തുടങ്ങുമ്പോൾ നിങ്ങൾ രണ്ടു അറ്റത്തു നിന്നും 9-ാമത്തെ വ്യക്തിയാണ് എങ്കിൽ ആ ക്യൂവിൽ ആകെ എത്ര പേരുണ്ട്?
A10
B19
C17
D18
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