System Analysis and Design
Which of the following statements is not true

None of these
at example of a hierarchical data structure is tree
pointers are useful in traversing a linked list
a checksum digit is used for detecting Errors in data transmission
All of these

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System Analysis and Design
An open rectangle

represents a process that transforms incoming data flow(s) into outgoing data flows
defines a source or destination of system data
None of these
is a data store-data at rest, or a temporary repository of data
identifies data flow

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