How many different 4​-letter words can be made...?

a. if the first letter must be Upper K comma Upper Z comma Upper Q comma or Upper M and no letter may be​ repeated? b. if repeats are allowed​ (but the first letter is Upper K comma Upper Z comma Upper Q comma or Upper M​)? c. How many of the 4​-letter words​ (starting with Upper K comma Upper Z comma Upper Q comma... show more a. if the first letter must be Upper K comma Upper Z comma Upper Q comma or Upper M and no letter may be​ repeated?
b. if repeats are allowed​ (but the first letter is Upper K comma Upper Z comma Upper Q comma or Upper M​)?
c. How many of the 4​-letter words​ (starting with Upper K comma Upper Z comma Upper Q comma or Upper M​) with no repeats end
in Upper R​?
3 answers 3