Question

How many whole are there from 1 to 1000 ?

Answer 1

Answer:

All numbers starting from 0 are whole numbers so 1 to 1000 all are whole numbers.

Step-by-step explanation:

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Answer 2

Answer:

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Step-by-step explanation:

Now here we have to find natural numbers where none of the digits should be repeated.

Here from 1 to 1000 we have 3 kinds of digits

One digit numbers, two digit numbers and three digit numbers.

One digit numbers:

We know that there are 9 possible to get single digit numbers from 1−9

⇒9ways

Two digit numbers:

Here the first digit can be from 1−9 and the second digit can be from0−9.

We also know that “zero” cannot be the first digit so we have excluded it

Total possible = 9×9=81 ways

Three digit numbers:

Here the first digit can be from 1−9 and the second digit can be from 0−9 but not the first digit 10−1=9.

And the third digit can be from 0−9 but not the same as the first and second digit.

Total possible=9×9×8=648

Here we have found all the possible under without repetition condition

Therefore total number of natural numbers from 1 to 1000 without repetition=648+81+9=738ways.

Note: Make a note that digits should not be repeated and kindly focus that zero can’t be the first digit for any kind terms.