An Urn Contains Two Red R Balls Numbered 1 and 2

question 138

Multiple Choice

An urn contains two red R balls numbered 1 and 2, five white W balls numbered 3, 4, 5, 6 and 7, and three black B balls numbered 8, 9 and 10. A ball is drawn from the urn. What is the probability that it is red or odd-numbered O? ​

• A)Pr(R or
• O) =
• B)Pr(R or
• O) =
• C)Pr(R or
• O) =
• D)Pr(R or
• O) =
• E)Pr(R or
• O) =

---

Definitions:

Equilibrium Reaction

A chemical reaction in which the rates of the forward and reverse reactions are equal, resulting in no net change in the concentrations of the reactants and products.

K

K is the chemical symbol for potassium, an essential dietary mineral and electrolyte necessary for various bodily functions, including nerve transmission and muscle contraction.

Acetic Acid

A weak, organic acid with the formula CH3COOH, known for its pungent smell and sour taste, and used in the production of vinegar.

Equilibrium Reaction

A chemical reaction in which the rate of the forward reaction equals the rate of the reverse reaction, resulting in no net change in the concentrations of reactants and products.