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Let x 1 , x 2 , …, x 100 be in an arithmetic progression, with x 1 = 2 and their mean equal to 200. If y i = i (x i − i ), 1  i  100, then the mean of y 1 , y 2 ,…, y 100 is :

1. 10100
2. 10101.50
3. 10049.50
4. 10051.50

Correct answer: 10049.50

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