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I need help with the following problem:
for i <- 5 to m do P(i)
where P(i) is executed (m-i) times provided m >= 3
I realize that this is the summation 
But I’m not sure exactly how to calculate the run time from this. Any suggestions?
If you count complexity of
P(i)as constant, then you have just loopm - 5times – it will give you complexityO(m)