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Instead of dividing it into 3 groups...why not into 4 groups of 3 each
(1) 3
(2)3
(3)3
(4) 3
1) (1) vs (2) - if equal weight
(1) vs (3) - from this attemp you will find which has the odd one and you will find in which group that odd one is
Now you got one group having 3 balls..in which the odd ball is
now 1 ball vs 1 ball ...solution found in 3 attempts
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