Question

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Answer 1

no it doesnt

Answer 2

\[\sum_{k=5}^{10} 2k-1\]

Answer 3

So this simply means, the sum of all 2k-1 starting from k=5 and ending at k=10

Answer 4

so:
(2*5-1)+(2*6-1)+ and so on till u get to(2*10-1)