5. suppose you choose a marble from a bag containing 3 red
marbles, and 5 blue marbles. you return the first marble to
choose again. find p(red then blue).
a
6
15
121
c
8

15/64

Step-by-step explanation:

Given

Red, R : 3 marbles

Blue, B : 5 marbles

Total : 5+3=8 marbles

If first marble is returned

P(Red) = 3/8

P(Blue) = 5/8

P (Red then Blue) = 3/8 x 5/8 = 15/64

< 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⭐