A.P.: ( 3, 8, 13, \ldots )
( a = 3 ), ( d = 5 )
[ a_n = 123 ] [ 3 + (n-1)5 = 123 ] [ (n-1)5 = 120 ] [ n-1 = 24 ] [ n = 25 ]
Answer: 25th term
11TH•Mathematics•Sequences And Series•Question 8
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Which term of the A.P. $3, 8, 13, \ldots$ is 123?
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