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 codes can be formed using the first 10 letters of the English alphabet, if no letter can be repeated?

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

How many 3-letter code words are possible using the first 10 letters of English alphabet if : no letter can be repeated ?

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 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 3-letter code words are possible using the first 10 letters of English alphabet if : letters are repeated ?

How many 3 letter words with or without meaning can be formed using 26 letters in English alphabet, if no letter is repeated?

How many 4 letter words can be formed using the letters of the word 'PROPORTION'.

How many different four letter words can be formed by using the four letters a,b, c, d, while the letter can be repeated ?