Answers

2014-04-12T20:36:25+05:30
Functions are relations answering a definite rule.
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2014-04-12T21:08:15+05:30
A relation is a diagram, equation, or list that defines a specific relationship between groups of elements. This is a relatively formal definition for a very basic concept. 
                
function is a relation whose every input corresponds with a single output. This is best explained visually.
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