JEE Math Practice Question
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 4th term of this A.P. is :
- A.$$a$$
- B.$${7 \over 3}a$$
- C.5$$a$$
- D.$${2 \over 3}a$$
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