Can a decision boundary for Logistic Regression be a straight line or a curve same as Linear Regression?

Yes. It all depends on the features.

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You mean if the features are just X1 or X2 that would be a straight line. And, If the features are X1, X2, X1^2 and some other polynomial terms, that would make the decision boundary to be non-linear.

Is my interpretation right?

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Yes that is correct.