Mathematics Tes...

The value of tan (cos^-1(4/5) + tan^-1 (2/3)) is equal to

What is the total number of different combinations of names, which can be made from the letters of the word MISSISSIPPI, using all the letters at a time?

On the occasion of Diwali, each student of a class sends greeting cards to every other. If there are 20 students in the class, then the total number of greeting cards exchanged by the students is

If no husband and wife play in the same game, then the number of ways in which a mixed double game can be arranged from among nine married couples is

The number of ways of painting the faces of a cube with six different colours is

What is the number of arrangements that can be made using all the letters of the word 'LAUGH', keeping the vowels adjacent?

If all permutations of the letters of the word AGAIN are arranged as in dictionary, then fiftieth word will be

The number of ways of dividing 20 persons into 10 couples is

Directions: The following question has four choices, out of which ONE or MORE is/are correct.