*$_A pin-jointed plane frame is unstable if (where m is number of memb – McqOptions

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1.	*$_A pin-jointed plane frame is unstable if (where m is number of members, r is reaction components and j is number of joints)?
A.	(m + r)<2j
B.	m + r = 2j
C.	(m + r)>2j
D.	none of the above
Answer» B. m + r = 2j

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