Question

Find the number of three digit numbers in all

Answer 1

Answer:

Number of three digit numbers = 900

Step-by-step explanation:

100,101,102,....,999 are three digit numbers.

Let a = 100, b = 999

Number of three digit numbers = b-a+1

= 999-100+1

= 900

Therefore,

Number of three digit numbers = 900

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Answer 2

$\fontsize{18}{10}{\textup{\textbf{Number of three digit numbers is 900.}}}$

Step-by-step explanation:

In a three digit number, we have

9 options for the first digit, i.e., 1, 2, 3, 4, 5, 6, 7, 8, 9,

10 options for the second digit, i.e., 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

and

10 options for the third digit, i.e., 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.

Therefore, number of ways in which a three digit number can be formed is given by

$n=9\times10\times10=900.$

Thus, the required number of three digit numbers is 900.