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In an E-R, Y is the dominant entity and X is a subordinate entity. Then which of the following is incorrect ?

1)Operationally, if X is deleted, & remains the same

2)Operationally, if X is deleted, so is Y

3)existence is dependent on Y

4)Operationally, if Y is deleted, so is X


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    Operationally, if X is deleted, so is Y

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