അഞ്ച് സംഖ്യകളുടെ ശരാശരി 20 ആണ്. ഇതിൽ ഒരു സംഖ്യ ഒഴിവാക്കിയപ്പോൾ ശരാശരി 23 കിട്ടി. ഒഴിവാക്കിയ സംഖ്യയേത്?
A4
B9
C10
D8
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ആദ്യത്തെ 7 ഒറ്റ സംഖ്യകളുടെ ശരാശരി എന്ത് ?