6. How many different five-letter combinations can be created from the word TWIST?
I got 42 which is not among the answer choices.
This is how I solved it:
if both T's are together, the number of ways = 4! = 24
when both T's are spaced they either are
in all three such cases, the total number of words = 3*3! = 18
total number of 5 letter words = 24+18 = 42.
Guys, I think I got it. I missed a few calculations in my last post.
when both T's together, the total number of ways = 4! = 24
when they are apart, they are
apart by one space :
total number of ways = 3*3! = 18
apart by two spaces :
total number of ways = 2*3! = 12
apart by three spaces
total number of ways = 3! = 6
total number of ways = 24+18+12+6 = 60.
how is the formula M!/L! is derived though?
for every person who doesn't try because he is
afraid of loosing , there is another person who
keeps making mistakes and succeeds..