how many number have ever decreasing digits (eg.98640 or 732 or 81)? please note that none of the following are ever decreasing numbers 2 or 9 or 12 or 443 or 5298..
a.10!/9
b,2!/1+3!/2..........+9!/8+10!/9
c.2!/2+3!/2..........+9!2+10!/2
d.2^10-11

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