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Let x 1 , x 2 , x 3 , x 4 be in a geometric progression. If 2, 7, 9, 5 are subtracted respectively from x 1 , x 2 , x 3 , x 4 , then the resulting numbers are in an arithmetic progression. Then the value of 24 1 (x 1 x 2 x 3 x 4 ) is :

1. 72
2. 18
3. 216
4. 36

Correct answer: 216

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