Question

which term of the series 3 ,8, 13, 18, 23 is 78?

Answer 1

78 =3+(n-1)5
75=(n-1)5
n-1=15
n=16
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Answer 2

The series 3,8,13,23,..... is an Arithmetic Progression (AP)
The first term of this series is (a) = 3
The common difference between each term (d) =5
nth term = 78 = a+(n-1)d
3+(n-1)5=78
3+5n-5=78
5n-2=78
5n=80
n=16
Therefore the answer for your question is 16th term.
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