3 के प्रथम 9 गुणजों का औसत क्� – McqOptions

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1.	3 के प्रथम 9 गुणजों का औसत क्या होगा? [ Income Tax 1989, RRB, 2008]
A.	15
B.	12
C.	18.5
D.	12.5
Answer» B. 12

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