I have a bunch of these different questions but they are little different than t

Question

I have a bunch of these different questions but they are little different than this one. I have no idea which formula to use or even start on.

Suppose a tribal language consists of only ten letters.
A,D,E,G,N,O,R,S,T,U .....

A.- what is the maximun possible number of 13- letter words that can be made?
B.- what is the maximun number of 7- letter words with no letters repeated?
C.- how many 8- letter word that start with a T,but contain no other TS.
D.-how many 14 letter words, have exactly 3Ds, 4 Rs, and 7As?

Explanation / Answer

A (10)^13 B 10p7 C 9p6 D 14!/3!4!7!

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