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Q: What is it when adding three numbers and regrouping gives the same sum?

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Adding three odd numbers will never equal an even number.

subtract the smallest one

3, 6, 9, 12, 15 and keep adding three till you get to 99.

They don't ! Adding an odd number to two odd numbers always results in an odd number !

Let x, y and z be even numbers. This means that (x + 1), (y + 1) and (z + 1) are all odd. Adding these three odd numbers gives (x + y + z + 3). Because the sum of any number of evens must be even as well - which can be easily proven with idea that where a = 2m and b = 2n, a + b = 2m + 2n = 2(m + n), and is even - adding 3 changes it to an odd number. This holds for any set of three odd numbers. i agree with this... but what about in the form of 2n+1?

99

Adding three further zeroes (or six, in Comonwealth English usage) to a trillion gives a quadrillion. Adding three further zeroes (or six, in Comonwealth English usage) to a quadrillion gives a quintillion. Adding three (or six) zeroes to a quintillion gives a sextillion. In the more widely used American system, a sextillion is 10 followed by 21 zeroes, while in the Commonwealth English usage, it is equal to 10 followed by 36 zeroes.

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