Inside the box of every cereal box contains a surprise

Inside the box of every cereal box contains a surprise gift. The store manager assures employees that 11 of the 51 boxes on the shelf have a secret decoder ring and inside the other 40 boxes on the shelf contain a different gift. If two cereal boxes are randomly selected from the shelf to purchase, what is the probability that both of them have the secret decoder ring? (Give answer as a decimal correct to least three decimal places.)

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