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Consider the following statements

 Chipping of a cutting tool is due to

1.  Tool material being too brittle

2. Hot hardness of the tool material

3.  High positive rake angle of the tool

 Which of these statements are correct?

 (a) 1, 2 and 3        (b) 1 and 3       (c) 2 and 3        (d) 1 and 2

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