railway RRB JE (CBT I + CBT II) Mock Test 2024 Structural Analysis Determinacy and Indeterminacy

What is the condition for stability of truss with b number of bars, r number of external support reactions with j number of joints ? 

1
b + r = 2j
2
b + r > 2j
3
b + r < 2j
4
b + r < j
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