Question

if a1 , a2 , ...... an are in ap then such that a4:a7= 2:3 then find a6: a8​

Answer 1

Answer:

3a + 9d = 2a +12d. ⇒ 3a - 2a = 12d - 9d. ∴ a = 3d. Now we have to find a6 / a8 = (a + 5d) / ( a + 7d). Substitute a = 3d. ⇒ (3d + 5d) / (3d + ...