Rahim's father has five sons naely Ten , Twenty , Thirty and Forty. what is the name of the fifth son?

Rahim's father has five sons naely Ten , Twenty , Thirty and Forty. what is the name of the fifth son? Correct Answer None of these

দেওয়া আছে, πr2 = 45r2  =  453.14r2 = 14.33r =  14.33 = 3.78

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