First, let's find the sum of 100 terms, where a1 is 1 and an = 100.
Sn = (n/2)(a1 + an)
S100 = (100/2)(1 + 100) = 50(101) = 5,050
The average of all whole numbers from 1 to 100 is: 5,050/100 = 50.5
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Yes.
The whole part - all of it.
The perfect numbers less than 100 are 6 and 28.
It depends on your definition of whole numbers. The classic definition of whole numbers is the set of counting numbers and zero. In this case, the set of whole numbers is not closed under subtraction, because 3-6 = -3, and -3 is not a member of this set. However, if you use whole numbers as the set of all integers, then whole numbers would be closed under subtraction.
There is no difference because all integers or whole numbers are considered to be rational numbers.