NCERT Solutions for Class 12 Maths Chapter 7 Exercise 7.4 Integrals in English and Hindi Medium updated for CBSE 2022-2023.

## Class 12 Maths Exercise 7.4 Solutions in Hindi and English Medium

### NCERT Solutions for Class 12 Maths Chapter 7 Exercise 7.4

Grade XII Mathematics ex. 7.4 solution are free to download in PDF as well as view online. All the steps of solutions are updated for session 2022-23 for all boards using latest NCERT Books. Download MP Board, UP Board Solution for class 12 Maths and Solutions Apps based on latest NCERT Solutions. If you are facing any problem to use the contents, please contact us without any hesitation. We will help you as much as possible.

Class: 12 | Mathematics |

Chapter 7: | Exercise 7.4 |

Topic Name: | Integrals |

Content Type: | Text and Videos Format |

Medium: | English and Hindi Medium |

#### 12th Maths Exercise 7.4 Solutions

NCERT Solutions for Class 12 Maths Chapter 7 Exercise 7.4 Integrals in English Medium is given below updated for new academic session 2022-23. Download NCERT Books and Offline apps based on the latest CBSE Syllabus for all boards who are using NCERT books as course books. Visit to Discussion forum to grow your knowledge and ask questions regarding to NIOS or CBSE Board.

#### Class 12 Maths Exercise 7.4 Solution in Videos

##### Questions from Board Papers

- 1. A man takes a step forward with probability 0.4 and backward with probability 0.6. Find the probability that at the end of eleven steps he is one step away from the starting point.
- 2. Suppose that 10% of men and 5% of women have grey hair. A grey haired person is selected at random. What is the probability that the selected person is male assuming that there are 60% males and 40% females?
- 3. Find P (A/B) if P(A)= 0.4, P(B)= 0.8 and P (B/A)= 0.6
- 4. Find P (A âˆ© B) if A and B are two events such that P(A) = 0.5, P(B) = 0.6 and P (A âˆª B) = 0.8
- 5. A soldier fires three bullets on enemy: The probability that the enemy will be killed by one bullet is 0.7. What is the probability that the enemy is still alive?

###### Important Questions for Practice

- Bag A contains 4 red, 3 white and 2 black balls. Bag B contains 3 res, 2 white and 3 black balls. One ball is transferred from bag A to bag B and then a ball is drawn from bag B. The ball so drawn is found to be red. Find the probability that the transferred ball is black.
- Three coins are tossed once. Find the probability of getting at least one head.
- A diet for a sick person must contain at least 4000 units of vitamins, 50 units of minerals and 1400 units of calories. Two foods A and B are available at a cost of â‚¹5 and â‚¹4 per unit respectively. One unit of food A contains 200 units of vitamins, 1 unit of minerals and 40 units of calories whereas one unit of food B contains 100 units of vitamins, 2 units of minerals and 40 units of calories. Find what combination of the food A and B should be used to have least cost but it must satisfy the requirements of the sick person. What is balanced diet and what is the importance of balanced diet in daily life?

Download NCERT Books for 12 Maths and Offline Apps 2022-23 based on new CBSE Syllabus. Ask your doubts related to NIOS or CBSE Board and share your knowledge with your friends and other users through Discussion Forum.