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The common difference of the arithmetic sequence is 5 and the 4th term is 21 what is a1
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The common difference of the arithmetic sequence is 5 and the 4th term is 21 what is a1

User Siddhesh Bondre
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1 Answer

1 vote

Explanation:

4th term is 21 subtract 5 to find third term is 16 , subtract 5 to find second tern is 11, subtract 5 one more time to find first term = a1 = 6

User AlexGad
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