Answer:
Note: This is too basic and you should know how to do it by yourself
1. 123 + 245 -> 368
2. 708 + 261 -> 969
3. 754 + 657 -> 1711
4. 1897 + 394 -> 2291
5. 2456 + 649 + 1341 -> 4446
Eg: -> 5 + 3 is 8
-> 2 + 4 is 6
-> 1 + 2 is 3 so, 368
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