Question

A class of 27 students is split between boys and girls in the ratio 5:4 . work out the probability that two students chosen at random are both boys.​

Answer 1

Answer:

tum khudi pata karlo hame to nhi pata

Answer 2

Answer:

let the number of boys be 5x and girls be 4x

now,

5x+4x = 27

9x=27

x=3

so, number of boys = 5×3 =15

probability =

$\frac{possible \: outcomes}{total \: outcomes}$

probability of choosing 1 girl = 15/27

probability of choosing another girl = 15-1/27 =14/27

so, probability of choosing 2 girls = 15/27* 14/27