Probably of my number

I have selected a two-digit number(positive integer) \text{two-digit number(positive integer)} .Then I omit the last digit of the number.

What is probably that when I omit the last digit the remain digit be a prime number?

Note: Input your answer as 4 dicimal places.

G o o d \color{#20A900}{Good} L u c k \color{#D61F06}{Luck}


The answer is 0.4494.

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