Question

in ap 4th 8th term are in ratio 1:2 if 10th term is 30 find ap I need full explanation​

Answer 1

Answer:

That is, a4:a8=1:2

Step-by-step explanation:

so,

⇒a+3d/a+7d = 1/2

⇒2(a+3d) = (a+7d)

⇒2a+6d = a+7d

⇒a = d

The tenth term is 30

that is, a10

⇒a+9d = 30

⇒a+9d = 30 [since a = d ]

⇒10a = 30

⇒a = 3

Therefore,

since a = d

common difference = 3