Find Best Kirmac Collision Placement Papers and Answers

Consider a function which, for a given whole number n,
returns the number of ones required when writing out all
numbers between 0 and n. For example, f(13)=6. Notice that
f(1)=1. What is the next largest n such that f(n)=n?

There are 1997 doors in a auditorium and as many as
people as the no of doors open enter the auditorium .A door
was closed and as many as people as no of doors open leave
the auditorium . the process was repeated till the no of
doors is equal to1.find the total no of peoples enter the

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