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Let s 1 ,s 2 ,s 3 .......,s 10 respectively be the sum of 12 terms of 10 A.Ps whose first terms are 1, 2, 3, ........, 10 and the common differences are 1, 3, 5, ......., 19 respectively. Then ∑ = 10 1 i i s is equal to

1. 7220
2. 7360
3. 7260
4. 7380

Correct answer: 7260

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