Question

How many natural numbers are there upto 1000​

Answer 1

Answer:

From 1 to 1000 we have

1 digit, 2 digit and 3 digit numbers

1 digit→ 9 ways

2 digit

↓9

9

cant take 0

9×9=81 ways

2nd digit can't take 1st digit number

similarly

3 digit

9

9

8

=9×9×8=648

=648+81+9=738 ways

hope this is helpful buddy

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