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20 संख्याओं का औसत 12 है पहली 12 संख्याओं का औसत 11 है और अगली 7 संख्याओं का औसत 10 है अंतिम संख्या क्या होगी? - 20 sankhyaon ka ausat 12 hai pahalee 12 sankhyaon ka ausat 11 hai aur agalee 7 sankhyaon ka ausat 10 hai antim sankhya kya hogee?
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