which term of an ap 25 ,20,15
................ is its first negative term
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a=25
d=-5
n=?
an=0
an=a+(n-1)d
=>0=25+(n-1)-5
=>0=25-5n+5
=>5n=30
=>n=6
hence,6th term of this A.P. is 0.
so.7th term is it's first negative term.
d=-5
n=?
an=0
an=a+(n-1)d
=>0=25+(n-1)-5
=>0=25-5n+5
=>5n=30
=>n=6
hence,6th term of this A.P. is 0.
so.7th term is it's first negative term.
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