ഒരു വരിയിൽ ഷെറിൻ ഇടത്തുനിന്ന് 12 -ാം മതും ആതിര വലത്തുനിന്ന് 19 -ാം മതുമാണ് .അവർ പരസ്പരം സ്ഥാനം മാറിയപ്പോൾ ഷെറിൻ ഇടത്തുനിന്ന് പതിനാറാമതായി.ആ വരിയിൽ ആകെ എത്ര ആളുകൾ ഉണ്ട് ?
A34
B19
C20
D21
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