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computing p2 hwlp

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can anyone help with these:
-explain the need of polish notation
-convert between reverse Polish notation and the infix form of algebraic expressions using trees and stacks
people plzzz help me....i dun evn know what are these notations!!!
 
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polish notation is helpful because we can get rid of algebric expressions..
eg.. (2+3)*5 can be represented by 235+* (in infix notation)
 
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