Find the sum. $$\sum _ { i = 1 } ^ { 4 } - i + 5$$
A)1
B)15
C)10
D)-10
E)9

Name: Find the sum. \[\sum _ { i = 1 } ^ { 4 } - i + 5\] A)1 B)15 C)10 D)-10 E)9
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Quizplus · Accepted Answer

The expression inside the summation is $-i + 5$. Evaluating this from $i = 1$ to $i = 4$, we get:  For $i = 1$, $-1 + 5 = 4$  For $i = 2$, $-2 + 5 = 3$  For $i = 3$, $-3 + 5 = 2$  For $i = 4$, $-4 + 5 = 1$  Adding these results: $4 + 3 + 2 + 1 = 10$.

Find the Sum ∑i=14−i+5\sum _ { i = 1 } ^ { 4 } - i + 5i=1∑4​−i+5

Find the Sum $\sum _ { i = 1 } ^ { 4 } - i + 5$