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The sum 1 + 2 . 3 + 3 . 3 2 + .... + 10 . 3 9 is equal to-

1. 4 10 3 2 12 + ⋅
2. 4 1 3 19 10 + ⋅
3. 5 . 3 10 – 2
4. 2 1 3 9 10 + ⋅

Correct answer: 4 1 3 19 10 + ⋅

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