manual system is a system involving data processing which does not make used of stored data, so it is hard to do programs like recording some data or information using this system because it may cause a wasting of time and losting some files, to overcome this problem you may use a computerized sysetm to work it easily.
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Math forms the foundation for information technology so there is a huge range of math problems that can be used in it, far too many to list.
yes
It is impossible to list all solutions, as there are infininte. For example, 9*6.
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loss of sleep, depression, stomach problems, the list goes on and on