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

Daxeel Soni , 12 Years ago
Grade 11
anser 1 Answers
Sher Mohammad

Last Activity: 10 Years ago

two identical digits remain in pair so we can count them as one digit.

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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