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assessment use the nth term of an arithmetic sequence an + = a₁ + (n - Dd to answer the following questions?
1.Find the common difference of the sequence if the first the term is 13 and the 12th
2. The 20th terms of an arithmetic sequence is 98. If the Common difference is 6, find the first term.

3. How many terms are there in the sequence of the first term is 5, the nth term is 395 and the common difference is 5.​