How many 3 letter (not necessarily distinct) words can be formed using the letters from the word TWIST ?
Choices:
A) 33  B) 54  C) 45  D) 60  E) None of the above
Two T's are used   In this case we have to select just one letter out of the remaining 33 (W, I, S) which can be arranges in 3 places.   So, the total possibilities are 3∗3=9   Total possibilities 24+9=332   So, the answer is 33.
<result>A</result>
How many 3 letter (not necessarily distinct) words can be formed using the letters from the word TWIST ?