Permutations and Combinations
The number of times the digit 5 will be written while listing the integers from 1 to 1000 is xyz then the value of (x+y+z) is equal to
Sonia decides to hang 6 different potted plants in a row in her shop. The money plant is to be hung at either end of the row. Find the number of different arrangements possible.
In how many ways can the letters of the word PERMUTATIONS be arranged if the.i) Words start with P and end with S.ii) vowels are all togetheriii) there are always 4 letters between P and S
Write all possible 3-digits numbers using the digits 3,1 and 5. Repetition of digits is not allowed.
How many 3-digit numbers can be formed from the digits 1,2,3,4 and 5 assuming that.
An examination paper consists of 12 questions divided into two parts A & B. Part A, containing 7 questions & part B contains 5 questions. A candidates is required to attempt 8 questions selecting at least 3 from each part. In how many ways can the candidates select the questions?