How many 2-digit odd numbers can be formed fr | vedclass

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(B) $2$-digit number has a unit's place and a ten's place.For the number to be odd,the unit's place must be filled by an odd digit. The available odd

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$15$

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(B) $2$-digit number has a unit's place and a ten's place.For the number to be odd,the unit's place must be filled by an odd digit. The available odd digits from the set ${1, 2, 3, 4, 5, 8}$ are $1, 3,$ and $5$.Thus,there are $3$ ways to fill the unit's place.Since repetition of digits is allowed,the ten's place can be filled by any of the $5$ given digits ${1, 2, 3, 4, 5, 8}$.Therefore,the total number of $2$-digit odd numbers $= 3 	imes 5 = 15$.

How many $2$-digit odd numbers can be formed from the digits $1, 2, 3, 4, 5$ and $8$,if repetition of digits is allowed?

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