यदि 20 परिणाम का औसत 40 और 30परि – McqOptions

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1.	यदि 20 परिणाम का औसत 40 और 30परिणाम का औसत 60 है तो सभी को मिलाने पर परिणाम का औसत क्या होगा ?
A.	52
B.	78
C.	56
D.	90
Answer» B. 78

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