Question 25
The number of two-digit numbers in which the tens digit and the units digit are different and both odd is
Correct Answer: 20
Solution
The units digit can be any of the $$5$$ odd digits $$1,3,5,7,9$$. After choosing it, the tens digit can be any of the remaining $$4$$ odd digits. Hence the total number is $$5\times4=20$$.
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