1.

The number of three-digit numbers having only two consecutive digits identical isA. `153`B. `162`C. `180`D. `161`

Answer» Correct Answer - 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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