SSC
Government Jobs Exams
Logical Reasoning
Number Series
The 5th, 8th and 11th terms of a G.P. are a, b, c
respectively, then which one of the following is
true -
(A) 2b = ac (B) b2
= ac
(C) a + b + c = 0 (D) None of these
Read Solution (Total 2)
-
- let x=1st term and r= c.r
so a=x*r^4, b=x*r^7, c=x*r^10
b^2=x^2*r^14
and a*c=x^2*r^14
so b^2=ac - 10 years agoHelpfull: Yes(0) No(0)
- B b^2 =ac
b/a = c/b
Hence b^2 =ac - 9 years agoHelpfull: Yes(0) No(0)
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