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What is the Value of ?

3 + 3 = 3

5 + 4 = 4

1 + 0 = 3

2 + 3 = 4

3 + 4 = 5

1 + 7 = ?

Give logic also

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Answer is 5(No. of Letters in 8-Eight)Logic : Answer is the number of letters of the Sum of the numbers.