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Sequential file searched to get to the required record

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Help in understanding how a sequential file is searched to get to the required record:

Assume a sequential file contains 20,000 records and 2 seconds are required to interrogate an entry. How long will we wait when retrieving a record from the middle of the file?

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Ideas show how a sequential file is searched to get to the required record. The solution is completely succinctly with explanation in under 100 words.

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The middle record would be the 10,001th record, as in sequential file, the searching ...

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