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# Three blocks A , B and C of equal mass m are placed one over the other on a smooth horizontal ground as shown in figure. Coefficient of friction between any two blocks of A,B and C is The maximum value of mass of block D so that the blocks A, B and C move without slipping over each other is

- 6 m
- 5 m
- 3 m
- 4 m

## The correct answer is: 3 m

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