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The number of natural numbers smaller th...

The number of natural numbers smaller than `10^4` of which all digits are different, is

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Given`10^4=10000`
so numbers upto 9999 is 4digit
Number of 4 digit number=`9 xx 9 xx 8 xx 7=4536`
Number of 3 digit number=`9 xx 9 xx 8 =648`
Number of 3 digit number=`9 xx 9 =81`
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