Answers

2015-08-04T20:57:52+05:30
Permutation applies here.
in the 3 digit number, let the first digit be filled in 6 ways.
considering that the digits should not be repeated,
the second digit can be filled in 5 ways.
then the 3rd digit can be filled in 4 ways.
so, no. of 3 digit numbers formed is 6x5x4=120
if you still have doubts, ask:)
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