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u want to search for a book ..it is either with ur mom or with ur dad...
one way is first go to ur mom..if she says yes she have ur book..then fine... else go to ur dad...hierarchial memory organisation... if first time ur mother says no then u wasted that time and then goes to ur dad...same way if u dont find ur word in first level memory than u have to go to second level and time of first level will also be added..

second way is like u have ur duplicate and both of u goes simultaneously..one to ur mom and other one to ur dad...if u find the book from ur mom..then ok...else u'll get it from ur dad but both these things are happening together...so no need to add double the access time...this is simultaneous memory access...u r trying to access all levels of memory simultaneously...
 

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eyeamgj asked Aug 27, 2018
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https://gateoverflow.in/39592/gate2016-2-50HOW TO KNOW IN SUCH TYPE OF QUESTION THAT WE NEED TO APPLY HIERARCHICAL OR SIMULTANEOUS APPROACH .....VERY CONFUSING ???