Serial numbers for an item produced in a factory are to be made using two letters followed by four digits (0 to 9). If the letters are to be taken from six letters of English alphabet without repetition and the digits are also not repeated in a serial number, how many serial numbers are possible?

Serial numbers for an item produced in a factory are to be made using two letters followed by four digits (0 to 9). If the letters are to be taken from twenty six letters of English alphabet without repetition and the digits are also not repeated in a serial number, how many serial numbers are possible?

How many codes containing 3 letters can be formed with the 9 letters of English alphabet if repetition is not allowed?

How many even numbers of 5 digits without repetition can be formed with the digits 1,2,3,4 and 5.

How many 4-letter code can be formed using the first 10 letters of the English alphabet, if no letter can be repeated?

How many 4 letter code can be formed using the first 10 letters of the english alphabet if no letter can be repeated.

A code consists of two letters of the alphabet followed by 5 digits .How many such codes are possible ?

How many 3 letter code combinations are possible using the first 10 letters of English alphbets if: i. no letter can be repeated, ii. letters can be repeated.

How many different numbers of 4 digits each can be formed with the ten digits 0,1,2,…9 when digits are not repeated?

A code word consists of three letters of the English alphabet followed by two digits of the decimal system. If neither letter nor digit is repeated in any code word, then the total number of code words, is

Find the number of four letter words which can be made using the letters of the word "HIPPOPOTAMUS", if not all four letters are different.