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AD is the median of a triangle ABC and O is the centroid such that AO = 10 cm. The length of OD (in cm) is
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Correct Option: B
According to question ,
D, is the mid-point of side BC. Point O is the centroid that divides AD in the ratio 2 : 1.
we draw a figure triangle ABC whose point O is centroid , 
AO = 10 cm
∴ OD = 5 cm.
