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n(n+1) 9. The rule for finding the nth item in a certain sequence is What is the fourth term in this sequence?
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n(n+1) 9. The rule for finding the nth item in a certain sequence is What is the fourth term in this sequence?

User Chris Dixon
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n(n + 1)

4th term

4(4 + 1) = 4(5) = 20

The fourth term is 20

User Cgx
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