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The sum 2 2 2 3 3 3 2 2 3 3 2 3 3 2 1 ) 3 2 1 ( 7 2 1 ) 2 1 ( 5 1 1 3 + + + + × + + + × + × +......... upto 10 th term is :

1. 660
2. 680
3. 600
4. 620

Correct answer: 660

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