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Logarithm - General Aptitude

Q1:

If logx y = 100 and log2 x = 10, then the value of y is:

A 210

B 2100

C 21000

D 210000

ANS:C - 21000

log 2 x = 10          x = 210.  logx y = 100  y = x100  y = (210)100     [put value of x]  y = 21000.