21. Which term of the AP 25, 20, 15, ... is the first negative term?
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Answers
Answered by
2
Answer:
Step-by-step explanation:
a=25
d=-5
thet nth term be first negative term
a+[n-1]d <0
25+[n-1]-5<0
25-5n+5<0
30<5n
6<n
thus 7th term is negative
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Answered by
4
Answer:
a=25,d=-5
an=a+(n-1)d
an=25+(n-1)-5
an=25-5n+5
an=30-5n...1
let an<0 put 1
30-5n<0
30<5n
6<n
so 1st negative term will be the 7th term
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