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Number of natural numbers lt2.10^(4), wh...

Number of natural numbers `lt2.10^(4)`, which can be formed with the digits, 1,2,3 only is equal to

A

`(3^(5).2.3^(4)-3)/2`

B

`(3^(5)-2.3^(4)+3)/2`

C

`(3^(7)-1)/2`

D

None of these

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