Question

Number of black beads in a box is 3 less than number of white beads. If probability of getting a black bead is 1/3. Find the number of black beads?​

Answer 1

Answer:

3

Step-by-step explanation:

no. of white beads = x(let)

therefore, no. of black beads = x-3

total no. of beads = x+x-3 = 2x-3

probability of getting black bead = 1/3

therefore,

(x-3)/(2x-3) = 1/3

or, 3*(x-3) = 2x-3

or, 3x-9=2x-3

or, 3x-2x=9-3

or x=6

therefore,. no of black beads = 6-3=3

Answer 2

Let number of white beads be x
So number of black beads is x-3
So total number of beads are x+x-3=2x-3
So x-3/2x-3=1/3
So,x=6
Black beads=x-3=6-3=3