Answer:
4 / 85766121 or 0.00000004664 to 11 decimal places.
or about 5 in 1 hundred million!
Step-by-step explanation:
Probability ( any letter other than d is drawn) = 1/21 as only d occurs more than once in riddle.
Probability (a letter d is drawn) = 2/21 because there are 2 d's in riddle.
To get our answer we multiply probabilities because each drawing of a letter is independent of other draws.
So the Probability of the word drawn being riddle
= 1/21* 1/21*2/21*2/21*1/21*1/21.