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Verified Answer :

soooobored

if its this
\(\sum^{4}_{k=13} k-1\)

well start with the first term
13-1
add the 2nd term
14-1
add the 3rd term
15-1
andd the 4th term
16-1

since the summation only goes to 4, we stop here

13+14+15+16-4*1
would be the answer to your summation

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