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Which of the following is / are true about User - based and Item - based Collaborative filtering? ( 1 ) In Item - based

Which of the following is/are true about User-based and Item-based Collaborative filtering?
(1) In Item-based Collaborative filtering, a users rating for a particular item depends more on a user similar to him/her.
(2) In User-based Collaborative filtering, a users rating for a particular item depends more on the items similar to that particular item.
(3) User-based Collaborative filtering is computationally more expensive (in the sense that computations are done online and not offline) than Item-based Collaborative filtering because usually in an Organization there are much more users as compared to the number of items/products.

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