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Four particles of masses m(1) = 2m , m(...

Four particles of masses `m_(1) = 2m , m_(2) = 4 m , m_(3) = m ` and `m_(4)` are placed at four corners of a square . What should be the value of `m_(4)` , so that the centre of mass of all the four particles are exactly at the centre of the square ?

A

2m

B

3m

C

6m

D

None of the above

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The correct Answer is:
D
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