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Which one of the following set of values give the minimum clear cover (in mm) for the main reinforcements in the slab, beam, column and footing, respectively, according to IS : 456-1978?

20, 25, 30, 75
5, 15, 25, 50
15, 25, 40, 75
none of the above

Correct Answer: 15, 25, 40, 75

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