A number lock on a suitcase has three wheels each labelled with ten digits 0 to 9. If opening of the lock is a particular sequence of three digits with no repeats, how many such sequences will be possible? Also, find the number of unsuccessful attempts to open the lock.

A combination lock on a suitcase has 3 wheels, each labelled with nine digits from 1 to 9. If an opening combination is a particular sequence of three digits with no repeats, what is the probability of a person guessing the right combination ?

The number lock of a suitcase has 4 wheels, each labelled with ten digits i.e. from 0 to 9. The lock opens with a sequence of four digits with no repeats. What is the probability of a person getting the right sequence to open the suitcase.

The number lock of a suitcase has 4 wheels, each labelled with ten digits i.e., from 0 to 9. The lock opens with a sequence of four digits with no repeats. What is the probability of a person getting the right sequence to open the suitcase?

A letter lock consists of three rings each marked with 10 different letters. In how many ways it is possible to make an unsuccessful attempt to open the lock?

A letter look consists of three rings marked with 15 different letters. If N denotes the number of ways in which it is possibel to make unsuccessful attempts to open lock, then

How many three digit numbers are there with no digit repeated?

In a three - digit number ABC, where A, B and C represent digits from 0 to 9, the value of the digit A equals the cube of the digits C. How many such three - digits numbers ABC exist ?

How many three digit numbers are there, with no digit repeated.

Preeti baked 352 butter cream cookies, 448 cashew nut cookies and 736 choconut cookies to sell at her stall in a fair. She wants to pack the cookies in packets so that each packet has the same number of cookies of the same kind. If she wants to pack the largest number of cookies possible in each packet, how many packets will she need to pack ? Also find the number of packets of each kind of cookies

Lock of a safe consists of five discs each of which features the digits 0, 1, 2, ….., 9. The safe can be opened by dialing a special combination of the digits. If the work day lasts 13 hours and to dial one combination of digits takes 5 seconds, then number of days sufficient enough to open the safe, are