JEE Main2019Math
Q.
Let a, b and c be in G.P. with common ratio r, where a 0 and If 3a, 7b and 15c are the first three terms of an A.P., then the 4th term of this A.P. is :
- A
- B
a
- C
- D
5a
Solution
Let a, b and c be in G.P. with common ratio r, where a 0 and If 3a, 7b and 15c are the first three terms of an A.P., then the 4th term of this A.P. is :
a
5a