How many three digit numbers can having only two consecutive digits identical is
How many three digit numbers can having only two consecutive digits identical is
(a) 153 (b) 162 (c) 168 (d) 163 (e) None of these
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(b) When 0 is the repeated digit like
100, 200, ...., 9 in number
When 0 occurs only once like
110, 220, ....., 9 in number
When 0 does not occur like
112, 211, ....., 2 × (8 × 9) = 144 in number.
Hence, total = 9 + 9 + 144 = 162.
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