SOLUTION: How many 4-letter combinations can be made from the word MATHLOVER if... A.) no repetition of letters is permitted:______ B.) letters may be repeated:________

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Question 1044103: How many 4-letter combinations can be made from the word MATHLOVER if...
A.) no repetition of letters is permitted:______
B.) letters may be repeated:_________
Found 2 solutions by MathLover1, ikleyn:
Answer by MathLover1(20849)   (Show Source):
You can put this solution on YOUR website!

There are different letters in the word MATHLOVER.
a) So we need letters from the letters in 'mathlover' and no repetition of letters is permitted.
If you choose the first letter you have possibilities, for the 2nd you have .. and so forth
Therefore:
Number of combinations =

b) You see you can do the same but if things might be repeated you have possibilities every time;
therefore number of combinations =

Answer by ikleyn(52756)   (Show Source):
You can put this solution on YOUR website!
.
On combinations and permutations see the lessons
    - Introduction to Permutations
    - PROOF of the formula on the number of Permutations
    - Problems on Permutations
    - Introduction to Combinations
    - PROOF of the formula on the number of Combinations
    - Problems on Combinations
in this site.

SOLUTION: How many 4-letter combinations can be made from the word MATHLOVER if... A.) no repetition of letters is permitted:______ B.) letters may be repeated:_________

SOLUTION: How many 4-letter combinations can be made from the word MATHLOVER if... A.) no repetition of letters is permitted: B.) letters may be repeated:___