Use "guess and check" on a calculator to determine the solution(s) to the following equations.
a) (n/2)=105 b) nC3=84 c) 11Cn=330
Please explain, thanks!

Question

Use "guess and check" on a calculator to determine the solution(s) to the following equations.
a) (n/2)=105 b) nC3=84 c) 11Cn=330
Please explain, thanks!

amistre64 · Answer

trial and error,  make a guess, if its wrong adjust your guess up or down as needed and try again

amistre64 · Answer

and that (n 2)  represents that binomal better than a fraction

amistre64 · Answer

(^n _2) may even express it as upn and bottom2

anonymous · Answer

Thanks I'll try it out. Except I don't think I would have much time to keep guessing on tests because it's time consuming.

amistre64 · Answer

its just what the directions said to do

amistre64 · Answer

11Cn is the simplest, since its something int the row, its not 11C0 11C1 11C11 or 11C10

the others are about finding the other part .... a 'halfway' trial is the quickest guessing method

n C 3 = 84  ; n is not 84 but its a trial,  84C3 is bigger than 84, so half it  try 42

42C3 = 11480  this is only going to take at best 7 tries ... to big, half it

21C3 = 1330,  half it again

10C3 = 120, half it again

5C3 = 10

so its either 6,7,8,9 try 7   7C3 = 35

8C3 = 56
9C3 = 84

amistre64 · Answer

itll take about 7 tries for nC2 = 105  les if you know if a better start than n=105