Question

the 10th term of an ap is 31 and 20 term is 71 find the 13th term.​

Answer 1

Step-by-step explanation:

your your answer for answer

Answer 2

Answer:

43

Step-by-step explanation:

nth term of an AP = a+ (n-1)d

a+9d=31.....(i)

a+19d=71.....(ii)

(ii)-(i)

10d=40

d=4

Now, a+9(4)=31

a= -5

13th term; a+ 12d= -5+12(4) = 43