Question

please answer fast...​

Answer 1

a2 + a7 = 30 [given]

a15 = 2 x a8 - 1 [ given }

a + 14d = 2 x { a + 7d } -1 [an = a +{n-1}d]

a +14d = 2a + 14 d -1

a - 2a = 14d - 14d -1

-a = -1

a = 1

putting value in the first equation

a2 + a7 = 30

a + 1d+ a + 6d = 30

2a + 7d= 30

2+ 7d=30 [ a=1 we found out above]

7d = 28

d=4

there for ap =

a= 1

a2= a + 1d = 5

a3= a + 2d = 9

...

AP = 1,5,9,13,17,21,25,29...