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Nine plus fifteen is 24!
They are the only numbers that have 4 letters, not counting zero: Four Five Nine.
Nine plus six equals fifteen. This is a basic arithmetic operation where you are adding two numbers together. In this case, you are combining the value of nine with the value of six to get the total sum of fifteen.
In the counting numbers 1 million minus 1 which is nine hundred and ninety nine thousand, nine hundred and ninety nine (999,999).