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Which of the following statements is true? A. For instability, at least one joint of the structure should be able to displace without causing a change in length of all the members. B. For instability, at least one joint of the structure should be able to displace without causing a change in length of at least one of the members.

Which of the following statements is true? A. For instability, at least one joint of the structure should be able to displace without causing a change in length of all the members. B. For instability, at least one joint of the structure should be able to displace without causing a change in length of at least one of the members. Correct Answer Only B

For Stable structure: Joint/s of the structure may or may not be displaced, but under no circumstances, there would be no change in length of any of the member.

For Instable structure: Displacement of any joint of the structure, would result in the change in length of at least one member. However, all of the members should not undergo strain or else it would be the case of mechanism.

Mechanism: Displacement of any joint of the structure, would result in the change in length of all of the members.

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