find the 9th term from the end (towards the first term) of the A.P.5,9,13,....+85
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a= 5 D=9-5=4 l= 85 n= 9
than formula is
l-(n-1)d
85-(9-1)4
85-32
53
so 9th term is 52
than formula is
l-(n-1)d
85-(9-1)4
85-32
53
so 9th term is 52
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