Question

There are 18 beads in a box some of them are white and remaining are black. The probability of drawing a blank beads is 1/3 then how many black beads are there in box.​

Answer 1

Step-by-step explanation:

P=1/3

1/3=x/18=x=6

no.of black beads=6

no.of red beads=12

Answer 2

Total number of beads = 18

Let the number of black beads be a.

$\sf {P\ (black\ bead) =\frac{Total\ number\ of\ black\ beads}{Total\ number\ of\ beads} =\frac{1}{3} }\\\\\\\sf {\Rightarrow \frac{a}{18} =\frac{1}{3} }\\\\\sf {\Rightarrow a = \frac{18}{3} }\\\\\sf {\Rightarrow a=6}$

Thus, there are 6 black beads in the box.