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n(n-1)/2+1

Example for n-7:

1, 2, 4, 7, 11, 16, ?

7(7-1)/2+1

7(6)/2+1

42/2+1

26+1

27

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Wiki User

14y ago

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22

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Anonymous

4y ago
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Q: What is the nth term for 1 2 4 7 11 16?
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