1. The total number of eight - digit landline telephone numbers that can be formed having at least one of their digits repeated is:
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By: anil on 05 May 2019 02.39 am
Total 8 digit number which can be made using all digits when repetition is allowed = $$10^8$$ = $$100000000$$ Total 8 digit number which can be made using all digits when repetition is not allowed = $$10*9*8*7*6*5*4*3$$ = $$1814400$$
Therefore, The total number of eight - digit landline telephone numbers that can be formed having at least one of their digits repeated = $$100000000$$ - $$1814400$$ = $$98185600$$. Therefore, option A is the correct answer.
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Therefore, The total number of eight - digit landline telephone numbers that can be formed having at least one of their digits repeated = $$100000000$$ - $$1814400$$ = $$98185600$$. Therefore, option A is the correct answer.