Question 39

Mathematics Logarithms Medium

If \(x=\log _{a} b c, y=\log _{b} c a\) and \(z=\log _{c} a b\), then \(\frac{1}{1+x}+\frac{1}{1+y}+\frac{1}{1+z}=\)

(A) \(a b c\)
(B) \(\sqrt{a b}+\sqrt{b c}+\sqrt{c a}\)
(C) 1
(D) \(x+y+z\)
View Dynamic Solution & Explanation
Correct Solution: Option C

Step-by-step Solution:

\(1+x=\log _{a} a+\log _{a} b c=\log _{a} a b c\) \[\] \(1+y=\log _{b} a b c\) \[\] \(1+z=\log _{c} a b c\), then \(\frac{1}{1+x}+\frac{1}{1+y}+\frac{1}{1+z}\) \[\] \(=\log _{a b c} a+\log _{a b c} b+\log _{a b c} c=1\). \[\] Choice (C)\[\]