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because all numbers like irrational numbers could not be included in the set of integers
this is the answer you require: [550,650) i.e all numbers from 550 including 550, till 650 excluding 650. If you want to know the no. of integers, it is: 100. If you want to know the no. of real numbers, we can't count them i.e. infinite no. of numbers!
The set of whole numbers includes all numbers greater than 0 that do not require decimals to be expressed. Because -16 is less than 0, it is not a whole number. It is an integer.
A non-negative number is a number which does not require a negation sign. There is a distinction to be made here between positive numbers and non-negative numbers, where non-negative numbers can include 0, while positive numbers do not include 0.
I assume the question refer to the sum of positive odd numbers up to 25. If so, the answer is 169. If not, please resubmit your question stating exactly what you require.