The 5th term of an a.P is 1 and the 11th term is -17 .Which term of the ap. Is.- 77
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a+4d=1_____(1)
a+10d=-17___(2)
subtract equation 1 from 2
-6d=18
D=-3
a+4d=1
a-12=1
a=13
An=a+(n-1)D
-77 =13+(n-1)-3
-90=(n-1)-3
30=n-1
n=31
a+10d=-17___(2)
subtract equation 1 from 2
-6d=18
D=-3
a+4d=1
a-12=1
a=13
An=a+(n-1)D
-77 =13+(n-1)-3
-90=(n-1)-3
30=n-1
n=31
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