Consider the Excel model for this problem $($as you have done in your group assignment$).$

Answer the questions $($a$)-($c$)$ below specifically for column N $($i$.$e$,$ cells N$10$:N$16)$

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$($a$)$ In COLUMN N$,$ which cell $($node$/$row$)$ will have a value of $+1?$

$($b$)$ In COLUMN N$,$ which cell $($node$/$row$)$ will have a value of $-1?$

$($c$)$ Briefly explain why do cells N$10$:N$16$ have exactly one $\text{'}+1\text{'}$ and one $\text{'}-1\text{'}$ and all other values are $0?$