The 8th term of a linear sequence is 18th and the 12th term is 26th .find the first term,common difference and the 20th term
Your question does not make sense
"The 8th term of a linear sequence is 18th"
In any arithmetic (linear) sequence, the terms either increase or decrease. A term can never repeat itself
if you meant:
The 8th term of a linear sequence is 18 , we can do something
Correct your question, and we'll go from there.
a+7d = 18
a+11d = 26
4d = 8
d = 2
in a+7d = 18
2+7d = 18