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The number of three-digit numbers having...

The number of three-digit numbers having only two consecutive digit identical `N ,` then the value of `(N//2)^(1//2)` is _______.

A

`153`

B

`162`

C

`180`

D

`161`

Text Solution

Verified by Experts

The correct Answer is:
B
`(b)` First two digits are identical.
`x x__to" Number of ways"=9xx9=81`
`__x xto"Number of ways"=9xx8=72` (when last two digits are non-zero)
`__0 0 to "Number of ways"=9` (when last two digits are zero)
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