If there are m unknown member forces, r unknown reaction components and j number

Question

If there are m unknown member forces, r unknown reaction components and j number of joints, then the degree of static indeterminacy of a pin-jointed plane frame is given by

Options:

A . m + r + 2j

B . m – r + 2j

C . m + r – 2j

D . m + r – 3j

Answer: Option C

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