Q: What is the sum of the first 13 odd numbers?

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Count how many of the numbers are odd. If an odd number of them are odd, then their sum is odd. If an even number of them are odd, then their sum is even.

13 + 37

The numbers are 11, 13 and 15.

The smallest of the three is 13.

1, 3 and 9

Related questions

Count how many of the numbers are odd. If an odd number of them are odd, then their sum is odd. If an even number of them are odd, then their sum is even.

An odd number of odd numbers can't add up to an even number.

The sum of any four odd numbers will never be equal to an odd number.

You can work this out by realizing that the sum of the first x odd numbers is equal to x2.Consider the following examples:The first three odd numbers: 1 + 3 + 5 = 9The first five odd numbers: 1 + 3 + 5 + 7 + 9 = 25The first ten odd numbers: 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 = 100In each case, the number of odds you're adding together is the square root of their sum. This means that the first 1500 consecutive odd numbers have a sum of 15002, which equals 2250000, or two and a quarter million.

The sum of two odd numbers MUST be even. So there is no answer to the question.

13 + 37

Go through each of the numbers, and count how many of them are odd. If you count an odd number of them, then their sum is odd. If you count an even number of them, then their sum is even.

The smallest of the three is 13.

The numbers are 11, 13 and 15.

The nine odd numbers whose sum is 50 are 1, 3, 5, 7, 9, 11, 13, 15, and 1.

They are 9, 11 and 13.

1, 3 and 9