The number of three digit having only two comsecutive digits identical is_______ (A) 153 (B) 162 (C) 180 (D) 161 Please explain step by step.

Next, both are identical so only one way to represent. first digit can't be zero so 9 choices 10 for other one. and these two can be arranged in two ways.

so 9*10*2=180 ways

Sher Mohammad

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