solve if you can
Probability
Level
3
there are x no of children which go to park with their grandfather . grandfather can take only 3 children at a time . grandfather himself goes 35 times and each CHILD goes 15 times. find no of children
NOTE- GRANDFATHER CANNOT TAKE SAME 3 GROUP OF CHILDREN TWICE
The answer is 7.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
we have c(x,3)=35 ==> x(x-1)(x-2)=210 but each children goes 15 times that's mean: c(x-1,2)=15 ==> (x-1)(x-2)=30 put 30 in the first equation we get : x*30=210 ==> x=7