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If a={5,6,7}, what happens when a.add(5) is executed?

If a={5,6,7}, what happens when a.add(5) is executed?

A. a={5,5,6,7}
B. a={5,6,7}
C. Error as there is no add function for set data type
D. Error as 5 already exists in the set

Answer: B. a={5,6,7}

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