How many four letter words are formed using the letters of the word ENTERTAINMENT?  Choose the correct choice.
A) 1716
B) 1616
C) 1816
D) 1516
E) 1761
The number of letters in the given word is thirteen.   The number of four letter words that can be formed using these thirteen letters is 13P4   = 13 * 12 * 11= 
<gadget id="calculator">13 * 12 * 11</gadget>
<output>1_716</output>
1716.   1716nswer: 1716
<result>A</result>
How many four letter words are formed using the letters of the word ENTERTAINMENT?