Q 3 The value of 5log57-7log75 is (a) log 2 (b) 1 (c) 0 (d) none of these - Maths - Mathematical Reasoning

Question

Q 3 The value of 5 log 5 7 - 7 log 7 5 is
(a) log 2
(b) 1
(c) 0
(d) none of these

Brijendra Pal · Accepted Answer

Hi, let x = 5log57-7log75=5log5712-7log7512= 5log5712-71log5712  since logax=1logxaso if we consider  m = log5712we have x = 5m-71mbut here we cannot see that terms will get cancelled so please recheck the question
Or none of these is the answer

Q.3. The value of 5 log 5 7 - 7 log 7 5 is (a) log 2 (b) 1 (c) 0 (d) none of these

Q.3. The value of $5^{\sqrt{\log_{5} 7}} - 7^{\sqrt{\log_{7} 5}}$ is
(a) log 2
(b) 1
(c) 0
(d) none of these