Degrees of Static Indeterminacy

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sharkey604
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Sorry this isn't for a particular question, just wondering if anyone knows how to determine degree of static indeterminacy (or degrees of freedom) in an arbritary frame?

Any help greatlly appreciated thanks.
 
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Sum the internal and external forces and moments.

Count the number of equations - M
Count the number of unknowns - N

Static Indeterminacy = M-N