Without repeating any digits, how many two-digit numbers can be formed using 2,4,5,6,7,9?
49
36
30
25
We must choose two numbers from the available six in order to form a two-digit number.
Consider two dashes. To fill up the first dash, we have 6 options and to fill up the second dash, we have 5 options.
Therefore, the number of two-digit numbers formed using the above numbers is
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