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Logarithm - General Aptitude

Q1:

If log a + log b = log (a + b), then:
b a

A a + b = 1

B a - b = 1

C a = b

D a2 - b2 = 1

ANS:A - a + b = 1

log a + log b = log (a + b)
b a
 log (a + b) = log a x b = log 1.
b a
So, a + b = 1.