Answer
$20$
Work Step by Step
The lower limit of $k$ is $1$ and the upper limit is $5$.
Thus, evaluate the given summation from $k=1$ to $k=5$ to obtain:
$=(1+1) + (2+1) + (3+1) + (4+1) + (5+1)
\\=2+3+4+5+6
\\=20$
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