A ഒരു നിരയിൽ ഇടത്തുനിന്ന് 19 -ാം മതാണ്. B അതേ നിരയിൽ വലത്തുനിന്ന് പത്താമതുമാണ്. അവർ പരസ്പരം സ്ഥാനം മാറിയപ്പോൾ B വലത്തുനിന്ന് ഇരുപതാമത് ആയി.എങ്കിൽ ആ വരിയിൽ എത്രപേരുണ്ട് ?
A38
B37
C39
D41
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