Question

15,9,3,-3 if it is in ap series what are the next 4 no.

Answer 1

15, 9, 3, -3 are in AP

So, the first term of an AP,

a=15

$d = 9 - 15$

$d = - 6$

so..

5th term of an AP IS

$a_{5} = a + 4d = 15 + 4( - 6) = 15 - 24 = - 9$

$a_{6} = a + 5d = 15 + ( - 9) = 15 + 5( -6) = 15 - 30 = - 15$