Question

Answer these que fast plz


Tmmrw is my exam so plz do it fast plz

Answer 1

let number of white balls be x

to not choose white ball means to select a non-white ball.

there are 10 non-white balls out of the (4+6+X)

so the probability is10/(4+6+X) this is equal to 2/3

10/(4+6+X)=2/3 by slvng we get x=5 white balls

hence there are 5 white balls sis .

Answer 2

let x be number of white balls

number of non white balls 10

probability to get non white =2/3

probability to get white =1/3

x/(10+x)=1/3

3x = 10+x

2x=10

x=5