Asked by chimingbell

The sum of all the even numbers less than and inclusive of E is 197580.
(a) What is the value of E?
(b) What is the sum of all the odd numbers less than E?
Answered by Steve
assuming you mean positive even numbers, there are 98790 of them. So

S = 98790/2 (2*2 + 98789*2)

do the same, figuring how many odds there are, then summing them up starting with a=1, d=2
Answered by chimingbell
how do you get 98790 positive numbers?
Answered by Steve
how many even numbers are there up to 20?
20/2, since they are 2 apart. Count 'em up:

2,4,6,8,10,12,14,16,18,20

If you are going up to n, there are

n numbers
n/2 even numbers (multiples of 2)
n/3 multiples of 3
and so on
Answered by chimingbell
How do you find the value of E then?
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