Abag has 10 yellow marbles and 4 blue marbles. half of the blue marbles are made of plastic. a marble is selected at random from the bag what is the probability that it is a blue, plastic marble? write your answer as a fraction in simplest form.

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐