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Question

Three particles, each of mass m are placed at the vertices of a right angled triangle as shown in figure. The position vector of the center of mass of the system is:
(O is the origin and ^i,^j,^k are unit vectors)
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A
23(a^i+b^j)
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B
23(a^ib^j)
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C
13(a^i+b^j)
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D
13(a^ib^j)
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