How to deal with the questions where in a single word with two condition:
1. few letters without repetition.
2. Rest of the letters with repetition.
Example: find the no. of words u can form using the letters of word BELONG.
where first 3 letters without repetition and and last three letters with repetition.
1. few letters without repetition.
2. Rest of the letters with repetition.
Example: find the no. of words u can form using the letters of word BELONG.
where first 3 letters without repetition and and last three letters with repetition.
