Why can visually impaired students read the Braille script?

Which property is used by visually impaired students to read?

The number of ways can 8 students sit round the table are

Why can't fish live on land ?

In a class 16 students read Mathematics , 17 read General Science and 6 both (of these ). The number of students in the class which read either Mathematics or general science is

A teacher wants to take 10 students to a park. He can take exactly 3 students at a time and will not take the same group of 3 students more than once. Find the number of times (i) each student can go to the park (ii) the teacher can go to the park.

A teacher wants to take 20 students to a park. He can take exactly 5 students at a time and will not take the same group more than once. Find the number of times each student can go to the park.

Number of ways in which 4 prizes can be distributed among 5 students if no student gets more than one prize is

A teacher wants to take 20 students to a park. He can take exactly 5 students at a time and will not take the same group more than once. Find the number of times that the teacher can go to the park

A teacher wants to take 20 students to a park. He can take exactly 5 students at a time and will not take the same group more than once. Find the number of times that a particular stadent can go to the park

Six teachers and six students have to sit round a circular table such that there is a teacher between any two students . The number of ways in which they can sit is