Question

is a term AP is 3 and the sum of the first five term is 1 by 4 the sum of the next five term find the 20th term​

Answer 1

there are term are 1234..

since a=1 d=2-1=1

since tn= a+(n-1)×d

20:=1+ (20-1)×1

20=1+(19)×1

20-1=19×1

19×19

20th = 361