Billy is picking a sandwich, a snack, a dessert, and a drink for his lunch. He can have ham, turkey, or salami sandwich; an apple, banana, or carrots for his snack; a cookie or brownie for his dessert; and apple or orange juice for his drink.

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< 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

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