Let a, b and c be in G.P. with common ratio r, where a ≠ 0\(\;{\rm{and\;}}0 < r \le \frac{1}{2}\) . If 3a, 7b and 15c are the first three terms of an A.P., then the 4th term of this A.P. is:

Let a, b and c be in G.P. with common ratio r, where a ≠ 0\(\;{\rm{a

1.	Let a, b and c be in G.P. with common ratio r, where a ≠ 0\(\;{\rm{and\;}}0 < r \le \frac{1}{2}\) . If 3a, 7b and 15c are the first three terms of an A.P., then the 4th term of this A.P. is:
A.	\(\frac{2}{3}{\rm{a}}\)
B.	5 a
C.	\(\frac{7}{3}{\rm{a}}\)
D.	a
Answer» E.

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Let a, b and c be in G.P. with common ratio r, where a ≠ 0\(\;{\rm{and\;}}0 < r \le \frac{1}{2}\) . If 3a, 7b and 15c are the first three terms of an A.P., then the 4th term of this A.P. is:

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