Posted by **Lisa** on Friday, January 18, 2008 at 9:47pm.

For PLANETS, find the number of :

4-letter words which must include a L and A

For MAMMALS, find the munber of:

a) 7-letter words

b) 7-letter word beggining with MA

c) 4-letter words

i) all letters different

ii) 2 letters same,2 different

iii) 2 pairs same leeters

iv) 3 letters same

- Data Management -
**drwls**, Friday, January 18, 2008 at 10:25pm
Can letters be used twice? Do the words have to be in the dictionary?

- Data Management -
**Lisa**, Friday, January 18, 2008 at 11:01pm
no

- Data Management -
**drwls**, Saturday, January 19, 2008 at 1:50am
In that case, for PLANETS, the possible four-letter combinations (in any order) are 5 x 4 = 20. For each combination, there are 4! = 24 ways (permutations) for arranging the letters. That makes 20x24 = 480 possible "words". Most will not be in the dctionary.

Try your own reasoning with the MAMMALS problem. We will be glad to critique your work.

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