Question

if a= 7,d=3and n=8 find an of the AP

Answer 1

Answer:

28

Step-by-step explanation:

General form of AP:

$a_{n}=a+(n-1)d$

Here, n = 8 , d = 3 and a = 7.

Therefore, $a_{8}=7+(8-1)3$

                       $=7+21$

                       $= 28$

Answer 2

Answer:

last term=28

 sum=140

Step-by-step explanation:

last term=a+(n-1)d

              =7+(8-1)3

              =7+(7)3

              =28

 sum=(a+l)n/2

      =(7+28)8/2

      =(35)4

      =140