A certain stock exchange designates each stock with a 1, 2 or 3 letter code, where each letter is selected from the 10 letters of the alphabet. If the letters may be repeated and if the same letters used in a different order, constitute a different code, how many diff stocks is it possible to designate with these codes?	Select the correct option
A) 1200
B) 996
C) 1110
D) 896
E) 1400
Pretty simple actually   Number of 1 letter symbols = 10   Number of 2 letter symbols = 10*10   Number of 3 letter symbols = 10*10*10   The answer is sum of the 3. = 10+100+1000= 
<gadget id="calculator">10+100+1000</gadget>
<output>1_110</output>
1110   So the answer is 1110.
<result>C</result>
A certain stock exchange designates each stock with a 1, 2 or 3 letter code, where each letter is selected from the 10 letters of the alphabet. If the letters may be repeated and if the same letters used in a different order, constitute a different code, how many diff stocks is it possible to designate with these codes?