Question: Consider a 20-block long file on a disk. If you are currently at the 10th logical block and want to access logical block 15, how

Consider a 20-block long file on a disk. If you are currently at the 10th logical block and want to access logical block 15, how many physical blocks must be read from the disk according to the index allocation scheme? Justify your answer. Assume that the information about the file is already in memory.

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