if this particle reached the speed of light then due to einsteins laws of special relativity the particles length would contract to zero and would therefore, be invisible and unable to find. In this case the particle has exceeded the speed of light as its velocity is infinity. using the same law...
i said that there are n-1 combinations the rooms can be filled. 1:n-1, 2 :n-2 .... n-1: 1
= n-1 ways
and the students can be arranged in n! ways therfore arrangements are (n-1)n!
prob wrong but who cares cant change it now