Permutations and Combinations
Number of ways in which 18Rs can be distributed amongst four persons such that no body receives less than 3Rs is
How many four digit numbers that are divisible by 4 can be formed using the digits 0 to 7 if no digit is to occur more than once in any number?
The number of ways in which the letters of the word ′′STRANGE′′ can be arranged so that the vowels may appear in the odd place, is
7 students of a hostel are to be allotted 7 beds. Among them Praveen does not want a bed next to Nandu because Nandu snores.Then in how many ways can you allot the beds?
Word from the letters of the word PROBABILITY are formed by taking all letters at a time.The probability that both B′s are not together and both I′s are not together is
Two variants of a test paper are distributed among 12 students. Number of ways of seating of the students in two rows so that the students sitting side by side by not have identical papers & those sitting in the same column have the same paper is :