-1+(2x9)=17
1 and 9 are not twos.
How about this: (2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2) /2 = 17
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To get a sum of 17 using only five twos, you can use the following equation: (2 + 2) x (2 + 2) + 2 = 17. This equation breaks down as follows: first, add two twos together to get 4. Then, multiply this by another set of two twos to get 16. Finally, add one more two to reach the sum of 17.
2+2+2+2-1=7
3*(2+4)-1 = 17
(2+2+2)2 - 2 = 34
An even number is always some quantity of 'twos' (2's), and any quantity of twos is an even number. The first even number is a quantity of twos, and the second even number is another quantity of twos. When you add the first quantity of twos to the second quantity of twos, you get a new quantity of twos. Since the new quantity of twos is a quantity of twos, it's an even number.