A container of marbles has 18 red, 15 blue, 17 green, and 20 yellow. Find each probability.

1. Probability of not picking a red or yellow marble.
2. Probability of picking a blue marble.
3. Probability of picking a red or yellow marble.
4. Probability of not picking a blue marble

i sorry i don"t know the answer

Step-by-step explanation:

answer:

sometimes

*i think

< 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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