A bag contains 18 balls: two green, five black, eight blue, a brown, a red and one white. If 17 balls are removed from the bag at random, what is the
probability that a brown ball has been removed?

17/18

Step-by-step explanation:

because since the brown ball is only 1 out of 18, it has a one of 18 chance of getting picked, but if 17 more are picked, then its chance increases, making it 17/18

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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25% is the answer