What is an explicit formula for an arithmetic sequence with a common difference of -2 and whose first term is one?
1 answer:
Answer:
= - 2n +3
Step-by-step explanation:
the explicit formula for an arithmetic sequence is
= a₁ + (n - 1)d
where a₁ is the first term and d the common difference
here a₁ = 1 and d = - 2 , then
= 1 - 2(n - 1) = 1 - 2n + 2 = - 2n + 3
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