Write the rule for the sequence 30, 29, 27 24

Sequence and nth term
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The difference between the terms decreases by 1 each time.

29-30=-1; 27-29=-2; 24-27=-3. The next term would be 20 (20-24=-4).

an+1=an-n, so, for example, a2=a1-1=30-1=29; a3=a2-2=29-2=27, ...

an+1=30-n(n+1)/2, or an=30-n(n-1)/2.

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