A block A kept on an inclined surface just begins to slicl if the inclination is 30°.
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Equation of motion for Block A is when it just atart sliding
mag sin30 -μamagcos30=0
sin30 -μacos30=0............1
Equation of motion for Block B is when it just atart sliding
mbg sin40 -μbmbgcos40=0
sin40 -μbcos40=0............2
clearly these equation does not depends upon mass of block so all three condition can be possible .
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