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