Question

1. Find d for an A.P., if
(i) t10 =20 , t9 =18
(ii) tn =7 , tn-1 =10​

Answer 1

Answer:

Step-by-step explanation:

i) t₁₀ = 20   , t₉ =18

  t+9d =20 , t+8d =18

 t+8d +d =20

18+d =20

d=2

ii)tₙ =7   ,  tₙ₋₁ = 10

t+(n-1)d =7  ,   t+(n-1-1)d =10

t+ dn -d =7   ,   t+dn-2d =10

         t+dn-d-d =10

          7-d=10

           d = -3

Answer 2

Hey dear , hope this helps you