Question
An Optical Storage Device is
__________.Solution
Optical storage, electronic storage medium that uses low-power laser beams to record and retrieve digital (binary) data. In optical-storage technology, a laser beam encodes digital data onto an optical, or laser, disk in the form of tiny pits arranged in a spiral track on the disk's surface.
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If  a 2 + b 2 + c 2 = 40 & ab + bc + ca = 12 then a + b+ c = ?
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