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The sum of the even numbers up to 2k, where k is an integer, is k(k + 1) = k2 + k

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All multiples of odd natural number can be written as the sum of consecutive natural numbers?

No. Odd numbers can be written as the sum of consecutive integers, but some multiples of odd numbers are even.


What is the sum of 50 natural numbers?

The sum of the first 50 natural numbers is 1,251.


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The sum of the first 200 natural numbers is 20,001.


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If this question means "in the interval 0 to 16 inclusive, is the sum of the odd numbers the same as the sum of the even numbers ?" then the answer is no. The sum of the even numbers is eight more than the sum of the odd ones.


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The sum of two odd numbers is always even; the sum of three odd numbers is always odd; the sum of four odd numbers is always even; the sum of five odd numbers is always odd; etc


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