Is m=6 ?

Is m=6 ? p L 1.5

we have to select 2 balls and it will be green so we will select two balls from green balls
so
 
mC2/m+9C2=1/7
on solving
 
(m! / (m-2! * 2!) ) / (m+9! / (m+7! * 2!) ) =1/7 From nCr=n! / r!*(n-r)!
on solving
(m! / (m-2)! ) * ( (n-7)! / (n+7)!) =1/7
 
after solving and cross multiplication
m^2+4m-12=0
on solving
m=-2,6
so m will be 6.

  • 1
What are you looking for?