What is the sum of all the even integers between 99 and 401 ?

Correct answer marked below

10,100

20,200

37,750

Correct

40,200

45,150

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What this question tests

Your command of divisibility, primes, factors, parity, and how the GMAT tests properties of integers.

Forgetting that 1 is not prime, that 0 is divisible by every integer, or that negative numbers flip your assumptions.