Question 355796
maximum no. of different 2 letter words = 26*25 = 650

  
(a)    650*8 = 5200
  
5200 + 1 = 5201

to sure 9 identical words 5201 words should be printed.





(b)  6501  = 650*10 + 1


so, there are at least 11 identical words.





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