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Question

How many three digit numbers are there in all?
(a) 100
(b) 101
(c) 99
(d) None of these

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Solution

As we know, there are 10 digits i.e.,0,1,2,3,4,5,6,7,8,9.
We can not use '0' at the hundred's place.
So, we can use only 9 digits at the hundred's place.
Also, we can use 10 digits at the remaining two places.
So, total numbers of 3-digit numbers=9×10×10=900
The total number of 3 digit numbers =900

Hence, the correct answer is option (D).


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