Theory of Machine
For a kinematic chain to be considered as mechanism

Two links should be fixed
One link should be fixed
There is no such criterion
None of the links should be fixed

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Any one of these
One lower pair and two additional links
Two lower pairs and two additional links
Two lower pairs and one additional link

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