Question 1138442
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(a)  {{{(1/6)*(1/6)*(1/6)*(1/6)*(1/6)}}} = {{{(1/6)^5}}} = {{{1/6^5}}},


     since at each of the 5 drawings the probability to get the needed letter is {{{1/6}}}.



(b)  {{{(1/6)*(1/5)*(1/4)*(1/3)*(1/2)}}},  or simply  {{{1/6!}}},


     since there is only one way to get the right configuration of 5 different symbols from 6 given different symbols.
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Solved, answered, explained and completed.