18-02-2017
Mathematics

contestada

How to solve for n using my knowledge of permutations

How to solve for n using my knowledge of permutations class=

Respuesta :

sheheryar91 sheheryar91

18-02-2017

NP5=18*N-2P4
N!/(N-5)!=18*(N-2)!/(N-6)!

(N(N-1)(N-2)!)/(N-5)*(N-6)!=18*(N-2)!/(N-6)!
N(N-1)/N-5=18
N^2-N=18N-90
N^2-19N-90=0
N=9,N=-10
-10 is not possible so N=9

Answer Link

Otras preguntas

A controversial bill is being debated in the state legislature. Representative Williams wants to estimate within 2 percentage points and with 95% confidence the

If we add a catalyst to the following equation, CO + H2O + heat CO2 + H2, which way will the equilibrium shift?

the length of a rectangle is 4 units more then its breadth.its perimeter is 28 units. what is the length

Use the graphing tool to find the local minimum and the local maximum for the given function. Over the interval (-3,-1], the local minimum is Over the interval

If friction is ignored and the ball is dropped, it experiences a gain in ____ and a decrease in ___. Question 8 options: kinetic energy; potential energy potent

How did farming spur the development of crafts

a database of the virus is called____

How have you seen the scientific method and the different steps epidemiologists use in the 2020 virus outbreak?

4. Which of the following is equivalent to 800 cm? a) 80000 nm b) 8000 mm c) 8.0x10^7 um d) 8.0x10^5 km e) 80 m

Help!!!!!!!!!!!!!!!!!!!!!!