The 6 term of an AP in 35 and the 13 term is 77 frin the 20 term

Answer 1

term 6 = a + 5 d = 35
term 13 = a + 12 d = 77
--------------------------------- subtract
-7 d = -42
d = 6
a + 5(6) = 35
a = 5
so
term n = 5 + (n-1) (6)
term 20 = 5 + 19*6 = 119

Answer 2

"frin the 20 term" ???
Do you ever even check to see what you have posted?