Search found 6 matches
Search found 6 matches • Page 1 of 1
- Sun Jan 05, 2014 5:55 pm
- Forum: Secondary: Solved
- Topic: Dhaka Secondary 2011/7
- Replies: 11
- Views: 7818
Solution: As we know that using $n$ letters $3$ times when repetition is allowed ,at most $n^3$ different words can be formed. So the big one needs $5$ letters as $5^3=125>120$ i got a different ans. if we follow $5^3$, we'll get some permutations twice, say BAA. but names should be different. my s...