500.5
Because:
1+2+3+.......998+999+1000
Add 1 to 1000 equaling 1001.
This makes a pair.
There are 500 more of these so 500 pairs.
So 1001x500= 500500
Finally divide it by 1000 because there are 1000 numbers. (1000-1=999+1=1000)
Concluding the answer to be 500.5
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All the odd numbers between 1 and 2001.
1001
There are 999 whole numbers less than 1000. Whole numbers are all the positive integers starting from 1 up to 999. The number 1000 is not included because it is not less than 1000. So, the total count of whole numbers less than 1000 is 999.
21124
There are 31 perfect square numbers between 1 and 1000 (including 1).