The sum of the first 50 even numbers is 2,550.
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The sum of the first 50 odd numbers is 2,500.
50
The question is quite ambiguous. If you're talking about all the even prime numbers between 4 and 50, then the sum is zero. No even number, except '2', is a prime number, so there aren't any between 4 and 50..
2500
No odd number of odd numbers can sum to an even number.