Digital Electronics
In a read-only memory information can be stored

 at the time of fabrication
 by the user only once during its life time
 by the user a number of times
 in any of the above ways depending upon the type of memory

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Digital Electronics
2421 code is

 non-weighted and non-self-complementing code
 weighted self-complementing code
 weighted non-self-complementing code
 non-weighted self-complementing code

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