if ninth and third term of ap are 4 and -8 which term is zero
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Answer:
7th term
Step-by-step explanation:
9th term=4
a+8d=4 (1st eq)
3rd term=-8
a+2d=-8 (2nd eq)
2nd eq-1st eq
a+2d=-8
a+8d=4
(-) (-)
-6d=-12
d=2
subtitute 'd' in 1st eq
a+8(2)=4
a+16=4
a=4-16
a=-12
an=0
a+(n-1)d=an
-12+(n-1)2=0
-12+2n-2=0
-14+2n=0
2n=14
n=7
7th term of the A.P is 0
I hope this answer may help you
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