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11-05-2018
Mathematics

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find the 20th term of an arithmetic sequence with a first term of 3 and a common difference of 5

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Аноним Аноним

11-05-2018

first term = 3, common difference = 5

an = a1 + d(n - 1)
an = 3 + 5(n - 1)
an = 3 + 5n - 5
an = 5n - 2

when n = 20
a20 = 5(20) - 2 = 198

Answer: 198

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