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How many three digit numbers abc are formed where at least two of the three digits are same.

260
285
252
253
Explanation:

Total 3 digit numbers = 9 x 10 x 10 = 900

Total number of 3 digit numbers without repetition = 9 x 9 x 8 = 648

So number of three digit numbers with at least one digit repeats = 900 - 648=252.

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