14 A formula for determining the finite sum, S, of an arithmetic sequence of numbers is
2 answers:
Answer:
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Step-by-step explanation:
Answer:
b = 2S/n - a.
Step-by-step explanation:
S=n/2(a + b)
a + b = S / n/2
a + b = 2S/n
b = 2S/n - a.
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