Question

the number of 3 digit numbers with 7 in the units place when repitition is allowed is

Answer 1

Answer:

     177

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Step-by-step explanation:

Answer 2

Answer:- 90

Combinatorics Question :-

There are 3 places for the numbers suppose :-   __   __  __

In the 1st place there are 9 choices (0 is not allowed as it must be a 3-digit no)

In the 2nd place there are 10 choices .

In the 3rd place we can only put a 7 , so only 1 choice .

By the multiplication principle (MP) , we get total number of 3-digit numbers with 7 in the units place and allowing repetition are :- 9*10*1 = 90

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