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Solution

✅ Correct Option: 1

In 734, 853 and 981 the first digit equals the sum of the other two: 3+4=73+4=7, 5+3=85+3=8, 8+1=98+1=9.

For 751, 5+1=65+1=6, which is not 7, so it is the odd one out.

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