Consider the following statements: 1. Round bar in a round hole forms a turning pair. 2. A square bar in a square hole forms a sliding pair. 3. A vertical shaft in a foot-step bearing forms successful constraint. Which of these statements are correct?

Consider the following statements: 1. Round bar in a round hole forms

1.	Consider the following statements: 1. Round bar in a round hole forms a turning pair. 2. A square bar in a square hole forms a sliding pair. 3. A vertical shaft in a foot-step bearing forms successful constraint. Which of these statements are correct?
A.	1 and 3
B.	1 and 2
C.	2 and 3
D.	1, 2 and 3
Answer» E.

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Consider the following statements: 1. Round bar in a round hole forms a turning pair. 2. A square bar in a square hole forms a sliding pair. 3. A vertical shaft in a foot-step bearing forms successful constraint. Which of these statements are correct?

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