The algebraic sum of moments of the forces forming couple about any point in their plane is * a. equal to the moment of the couple b. constant c. both of above are correct O d. both of above are wrong O e. none of the above A number of forces acting at a point will be in equilibrium if * O a. their total sum is zero b. two resolved parts in two directions at right angles are equal C. sum of resolved parts in any two perpendicular directions are both zero O d. all of them are inclined equally e. none of the above

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