Structural Analysis
If in a rigid-jointed space frame, (6m + r) < 6j, then the frame is

Stable and statically determinate
None of these
Stable and statically indeterminate
Unstable

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Structural Analysis
To generate the j th column of the flexibility matrix

a unit force is applied at coordinate j and the forces are calculated at all coordinates
a unit force is applied at coordinate j and the displacements are calculated at all coordinates
a unit displacement is applied at co-ordinate j and the displacements are calculated at all co-ordinates
a unit displacement is applied at co-ordinate j and the forces are calculated at all coordinates

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