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hi shuvam
option c
without any restriction means without repitition
9 * 10 * 10 * 10 * 10 = 90000
use fundamental theorom of addition and multiplication
in ten thousands place you can place 9 digit ( excluding 0 ) in all the other places we can place 10 digits
Each digit can be 0 or 1 or 2 .. or 10.
10 choices * 10 choices * ... 10 choices = 100000
HTH
9xx10x10x10x10=90000 five digit numbers with out any restriction
ANSWER IS OBVIOUSLY,,,,,,,,9*10*10*10*10=90000
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