In how many ways can a five-letter password be chosen, using the letters A, B, C, D, E, F, G, and/or H such that at least one letter is repeated within the password?	Pick one: A) 720 B) 864 C) 900 D) 936 E) 26048
Total number of four letter passwords = 8*8*8*8*8= 
<gadget id="calculator">8*8*8*8*8</gadget>
<output>32_768</output>
32768 ------(1)   Total number of passwords in which no letter repeats= 8C5*5!= 56*120= 
<gadget id="calculator">56*120</gadget>
<output>6_720</output>
6720------(2)   therefore required value= (1)-(2)= 32768-6720= 
<gadget id="calculator">32768-6720</gadget>
<output>26_048</output>
26048   26048
<result>E</result>
In how many ways can a five-letter password be chosen, using the letters A, B, C, D, E, F, G, and/or H such that at least one letter is repeated within the password?