NCERT 2022 | रेशो से वस्त्र तक - L8 | From fiber to fabric | CLASS7 विज्ञान | 8AM Class by Akash Sir

There are 5 students in class 10, 6 students in class 11 and 8 students in class 12. If the number of ways, in which 10 students can be selected from them so as to include at least 2 students from each class and at most 5 students from the total 11 students of class 10 and 11 is 100 k, then k is equal to _______.

Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows: 1 6 2 3 5 12 5 8 4 8 10 3 4 12 2 8 15 1 17 6 3 2 8 5 9 6 8 7 14 12 (i) Make a grouped frequency distribution table for this data, taking class width 5 and one of the class intervals as 5 - 10. (ii) How many children watched television for 15 or more hours a week?

Two towns A and B are 160 km apart. A bus starts from A to B at 7 am at a speed of 50 km/h. Another bus starts from B to A at 8 am at a speed of 60 km/h. The time of their meeting is

A person starts to walk at 7 am from A and reaches B at 11 am and another person starts to walk from B at 8 am and reaches A at 11:30 am. Find the time at which they will meet each other.

A person from A starts to walk at 7 am and reaches B at 1 pm and another person starts to walk from B at 8 am and reaches A at 11 am. Find the time at which they meet each other.

Ratio of First ,Second and Third Class train fares between two stations was 8:6:3 .First Class and Second Class train fares are reduced by 1/6 and 1/12 repectively .Ratio of no of passengers in first, second and third class in a year is 4:9:24 .From a stattion total sale of ticket of Rs. 355600 .First the amount collected from first class .

A school has five houses A, B,C,D and E. A class has 23 students, 4 from houses A, 8 from house C, 2 from house D and rest from house E. A single student is selected at random to be the class monitor. The probability that the selected student is not from A, B and C is