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sum of even number: n((first even+last even)/2)

where, n = total number of even numbers

But, you can't use the Formula: N(N+1)
How to Find N = (First Even + Last Even)/2 - 1

For example, let's find the sum of even numbers between 102 to 200.

=50((102+200)/2)
=7550, which is right.

by kiranrai.ch

Sun Jan 10, 2016 9:08 pm
Forum: GMAT Math
Topic: Formula for consecutive, even, odd integers
Replies: 12
Views: 658725