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Logarithm - General Aptitude

Q1:

If ax = by, then:

A
log a = x
b y

B
log a = x
log b y

C
log a = y
log b x

D None of these

ANS:C -

log a = y
log b x

ax = by  log ax = log by  x log a = y log b

log a = y .
log b x