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m1 and m2 are the members of two individual simple trusses of a compound truss. The compound truss will be rigid and determinate if

m = m1 + m2
m = m1 + m2 + 1
m = m1 + m2 + 2
m = m1 + m2 + 3

Correct Answer: m = m1 + m2 + 3

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