Posted by kC on Monday, June 7, 2010 at 8:40pm.
First lets look at the number of combinations (order won't matter) to go the 10 steps
Behind it I will then do the number of permutations
2 2 2 2 2 ---- 1
2 2 2 2 1 1 --- 6!/(4!2!) = 15
2 2 2 1 1 1 1 --- 7!/(3!4!) = 35
2 2 1 1 1 1 1 1 --- 8!/(2!6!) = 28
2 1 1 1 1 1 1 1 1 --- 9!/(1!8!) = 9
1 1 1 1 1 1 1 1 1 1 --- 1
total = 1+15+35+28+9+1 = 89
Related Questions
8th grade - Laura is training her pet white rabbit, Sugar, to climb up a flight ...
8th grade - a rabbit can climb one or two steps at a time on a ten step ...
math - An elf has a staircase with 10 steps to climb. Each step it takes can ...
math - An elf has a staircase with 10 steps to climb. Each step it takes can ...
physics - A 680 newton student runs up a flight of stairs 3.5 m high in 11.4 ...
Math - A baby rabbit moves 5 inches forward with each hop and his mother moves ...
physics - a boy weighing 350N runs up a flight of stairs consisting of 20 steps ...
Algebra Grade 7 - A cat likes to play on stairs. Starting at the bottom landing...
physical Science - Two people who weigh the same climb a flight of stairs. The ...
physics - a person carries a 58kg package of books up a flight of stairs the ...
For Further Reading
