You play a game where you are to guess under which of 4 cups a coin has been placed. how many times would you expect to guess correctly in 20 plays of the game? note that the coin is moved after each play.

< 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⭐

25% is the answer