 
Arturo O. answered  11/15/19
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Note that the element on the right is 5 units lower than its neighbor on the left, so
Ni+1 = Ni - 5
Seth S.
asked  11/15/19 
Arturo O. answered  11/15/19
Experienced Physics Teacher for Physics Tutoring
Note that the element on the right is 5 units lower than its neighbor on the left, so
Ni+1 = Ni - 5
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