2022_IAS_Qn A79. What is the number of numbers of the form 0.XY, where X and Y are distinct

Описание к видео 2022_IAS_Qn A79. What is the number of numbers of the form 0.XY, where X and Y are distinct

 What is the number of numbers of the form 0.XY, where X and Y are distinct non-zero digits?
(a)    72
(b)    81
(c)     90
(d)    100

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