In a certain code language, 1875 means 'wound the round watch', 6143 means 'a cake is round' and 7321 means 'watch a round wheel'. Find the code for 'watch'.
In the code language,
1875 means 'wound the round watch' ........(1)
6143 means 'a cake is round' ...........(2)
7321 means 'watch a round wheel' ..........(3)
Comparing (1) and (2), the code for 'round' is 1
Comparing (1) and (3), the code for 'round watch' is 17
$$\therefore\ $$The code for 'watch' is 7
Hence, the correct answer is Option D
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