A company assigns product codes consisting of all the letters in the alphabet.How many product codes are possible if the company uses at most 6 letters in its codes, and all letters can be repeated in any one code?  Choose the correct choice from the following choices:
A) A.321272406 B) B.308915776 C) C.11881376 D) D.456976 E) E.17576
The no of ways in which the company can make codes of 1 letter : 26   # for 2 letters :   26*26= 
<gadget id="calculator">  26*26</gadget>
<output>676</output>
676   # for 3 letters :   26 * 26*26= 
<gadget id="calculator">  26 * 26*26</gadget>
<output>17_576</output>
17576   # for 4 letters :   26 * 26*26*26= 
<gadget id="calculator">  26 * 26*26*26</gadget>
<output>456_976</output>
456976   # for 5 letters :   26 * 26*26*26*26= 
<gadget id="calculator">  26 * 26*26*26*26</gadget>
<output>11_881_376</output>
11881376   # for 6 letters :   26 * 26*26*26*26*26= 
<gadget id="calculator">  26 * 26*26*26*26*26</gadget>
<output>308_915_776</output>
308915776   The total : By adding all of them , 26+676+17576+456976+11881376+308915776=321272406   A.321272406
<result>A</result>
A company assigns product codes consisting of all the letters in the alphabet.How many product codes are possible if the company uses at most 6 letters in its codes, and all letters can be repeated in any one code?