Question

there are 12 identical balld of different colours in a bag. if 6 more black balls are added then the probability of drawings black balls increase by 1/12. find the original number of black balls​

Answer 1

answer

x+6/18 = ( x/12 ) = x = 3

explanation

Initially, total number of balls =12

No. of black balls =x

So, P(black ball) = 12 / x

If 6 more black balls are added, total

number of balls =12+6=18

NO. of black balls =x+6

P(black ball) = 18x+6

Given the probability of drawing a black ball is now double of what it was before

So, 122x = 18(x+6)

x/ 6= 18(x+6)

3x=x+6

2x=6

x=3

So, the number of black balls present initially =3.

please mark BRAINLIST ANSWER