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Find the first negative term of the sequence 999,995,991,987 Please give me answer in full description

Find the first negative term of the sequence 999,995,991,987
 
Please give me answer in full description
 

Grade:11

1 Answers

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8 Points
5 years ago
a=999, d=-4, tn=a+(n-1) d, let tn=-1, so 999+(n-1) (-4) =-1, (n-1) (-4) =-1-999, (n-1) =-1000/-4, so(n-1) =250, n=250+1=251, so n=251

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