Question

First term correlate with second do same for third and fourth term
50 : 2525 :: 70: ?​

Answer 1

Step-by-step explanation:

Let a,d and an be the first term,common difference and nth term of given AP.

Given, a4=3a

⇒a+3d=3a

⇒2a=3d

⇒a=23d                        ..(1)

a7=2a3+1                          (given)

⇒a+6d=2(a+2d)+1

⇒a+6d=2a+4d+1

⇒a−2d=−1             (2)

Substitute a = 23d in equation (2)

23d−2d=−1

⇒−d=−2

⇒d=2

and a = 23d = 3

So, first term is 3 and common difference is 2

Answer 2

Step-by-step explanation:

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