5. Linear pattern III

Rows of a triangle are formed using matchsticks 
 
image.png
 
That is, for \(1\) triangle - \(3\) sticks used
 
             For \(2\) triangles - \(5\)  sticks were used...
 
(a) Identify the pattern
 
 
(b) Write the linear expression
 
 
(c) Find sticks need for \(21\) triangles.
 
 
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