The answers are 200 and 45720 the rule is for every 1 cm it is 10 mm so basicaly if you have 10cm it would be 100 mm you just need to times your cm number by 10
2.34 x 10 to the 9th power i think
It's just a math equation.
Any one of the runners could be 1st.
Every runner except for the one that was 1st could be 2nd.
Every runner that wasn't 1st or 2nd could be 3rd.
100*99*98=970200 groups.
This involves permutations because order does matter.
Hope this helps!
