Permutations an...

How many numbers can be formed from the digits 1,2,3,4 when the repetition is not allowed

9 balls are to be placed in 9 boxes and 5 of the balls cannot fit into 3 small boxes. The number of ways of arranging one ball in each of the boxes is

How many numbers lying between 999 and 10000 can be formed with the help of the digit 0,2,3,6,7,8 when the digits are not to be repeated

The value of ⁿP_r is equal to

3 Note of Rs. 100 and 5 note in which first of Rs. 1, second of Rs. 2, Third of Rs. 5, fourth of Rs 20 and fifth one of Rs 50 distributed among 3 children such that each child receives at least one note of Rs.100. The total number of ways of distribution

Let the eleven letters A,B, ...., K denote an arbitrary permutation of the integers (1,2,....,11), then (A – 1)(B – 2)(C – 3)....(K – 11)

If the letters of the word SACHIN arranged in all possible ways and these words are written out as in dictionary , then the word SACHIN appears at serial number

In how many ways n books can be arranged in a row so that two specified books are not together

Total number of four digit odd numbers that can be formed using 0,1,2,3,5,7 are

Numbers greater than 1000 but not greater than 4000 which can be formed with the digits 0,1,2,3,4 (repetition of digits is allowed), are