# CBSE Class 10-Mathematics: Chapter –15 Probability Part 5

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**Question 5:**

defective pens are accidently mixed with good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is a good one.

**Answer:**

Total number of favourable outcomes

Number of favourable outcomes Hence, P(getting a good pen)

**Question 6:**

Which of the following is polynomial?

(a)

(b)

(c)

(d) None of these

**Answer:**

(d) None of these

**Question 7:**

Polynomial is a

(a) Linear polynomial

(b) Quadratic polynomial

(c) Cubic polynomial

(d) Bi-quadratic polynomial

**Answer:**

(d) Bi-quadratic polynomial

**Question 8:**

If and are zeros of , then the value of is

(a)

(b)

(c)

(d)

**Answer:**

(b)

**Question 9:**

The sum and product of the zeros of a quadratic polynomial are respectively. The quadratic polynomial is

(a)

(b)

(c)

(d)

**Answer:**

(b)

**Question 10:**

Cards each marked with one of the numbers are placed in a box and mixed thoroughly. One card is drawn at random from the box, what is the probability of getting an even prime number?

(a)

(b)

(c)

(d)

**Answer:**

(a)

**Question 11:**

A bag contains red and black balls. A ball is drawn at random from the bag. What is the probability of getting a black ball?

(a)

(b)

(c)

(d) None of these

**Answer:**

(c)

**Question 12:**

A dice is thrown once, what is the probability of getting a prime number?

(a)

(b)

(c)

(d)

**Answer:**

(b)