Question: Which of these are true: a) a sparse matrix representation is more memory efficient b) According to the PageRank model, a page with more in-links

Which of these are true: a) a sparse matrix representation is more memory efficient b) According to the PageRank model, a page with more in-links will always have higher rank than a page with less in-links c) For PageRank to be computed, the stochastic adjacency matrix could be stored on the disk, but the rank vector has to be stored in main memory

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