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
0 is the identity under addition.
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.........