
Ex 7.1
Last updated at May 29, 2018 by Teachoo
Ex 7.1, 3 How many 4-letter code can be formed using the first 10 letters of the English alphabet, if no letter can be repeated? No. of letters = 10 Code is of the form Total number of possible 4-letter code = 10 × 9 × 8 × 7 = 5040 Hence 5040 ways 4 letter code can be formed