Seven out of thirty students walk to school. Two students are chosen without
replacement. What is the probability that both students walk to school?

7⁄145 = 4.8%

Step-by-step explanation:

P(both students walk) = 7⁄30 · 6⁄29 = 7/145

< 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⭐