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 words are possible using the first 10 letters of English alphabet if : letters are 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 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 letters in the word MADHURI if (a) letters can be repeated (b) letters cannot be repeated.