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How many 5-digit numbers can be formed b...

How many 5-digit numbers can be formed by using the digits 0, 1 and 2?

Text Solution

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The correct Answer is:
162
The ten-thousand's place can be filled by 1 or 2, i.e., in 2 ways.
Each of the other 4 digits can be filled in 3 ways.
Required number of numbers `=(2xx3xx3xx3xx3)=162.`
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