A) \[5.5\]
B) \[6\]
C) \[7.5\]
D) \[10\]
Correct Answer: A
Solution :
By definition, \[A.M.=\frac{1+2+3+....+10}{10}=5.5\] By shortcut, A.M. \[=\frac{10+1}{2}=5.5\]
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