Adding zero to a number leaves the number unchanged.
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Any number multiplied by zero = 0
Only 0 and 2.
Add to these successions of numbers the number that logically follows: 1, 1, 2, 3, 5
the next number in the sequence is 25............starting at the beginning, you add the odd numbers to the existing number to get the answer. Add "1" to 0, get 1; add "3" to 1, get 4; add "5" to 4, get 9; add "7" to 9 to get 16........and add "9" to 16 to get 25.........
0 is the identity under addition.