Piyush Maheshwari
Last Activity: 6 Years ago
For 7 letter words with the given conditions, no. of words = 5C2 * 21C5 * 7! [select 2 vowels, 5 conso, arrange}
(Assuming that the letters are distinct)
If the letters can be repeated, no. of words = 7C2 * (5^2) * (21^5) {select place for both the vowels, select 2 vowels out of 5, select 5 consonants out of 21}