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Mathematics
Medina
28 October, 13:11
Find S5 when Sn = 40 - 8n
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John Hart
28 October, 15:58
0
S (n) = - 8n + 40
Substitute 5.
S (5) = - 8 (5) + 40
= - 40 + 40
S (5) = 0
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