Since the word "probability" contains only letters, then the probability of choosing a letter from the word "probability" is 1, i.e. it is certain to happen.
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2/11
1/6 if the letter is chosen at random.
The sample space consists of the letters of the word "PROBABILITY" = {P,R,O,B,A,I,L,T,Y}
It is 1/6.
The probability is 1. The letters in the word mathematics are all constants, not variables!