Question

make 3 4 or 5 letter words from the word dictionary

Answer 1

word  dictionary
A- 1 times
C- 1 times 
D- 1 times
I - 2 times
N - 1 times
R - 1 times
T - 1 times
Y - 1 times
so.when I is not used then 
3 letter words will be 7×6×5= 210
4 letter words will be 7×6×5×4= 840
5 letter words will  be 7×6×5×4×3= 2520
 now when I is used then 
3 letter words = (7×6×5)/2 = 105
4 letter word = (7×6×5×4)/2= 420
5 letter words = (7×6×5×4×3)/2×= 1260

hope this is the best ans and it's explanation

Answer 2

3 letter word not
4 letter word city
6 letter word nation