Let …, b and c be in G.P. with common ratio r, where … … 0 and 0 < r … … . If 3…, 7b and 15c are the first three terms of an A.P., then the 4^th term of this A.P. is :

Option A. a = a, b = ar and c = ar²

Sequences and Series

JEE Main 2019 · 10 Apr, Evening shift · Q5250

MathematicsMedium178×since 2002Q5250

Let

a

, b and c be in G.P. with common ratio r, where

a

\ne

0 and 0 < r

\le

{1 \over 2}

. If 3

a

, 7b and 15c are the first three terms of an A.P., then the 4^th term of this A.P. is :