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If log e a, log e b, log e c are in an A.P. and log e a – log e 2b, log e 2b – log e 3c, log e 3c – log e a are also in an A.P., then a : b : c is equal to

1. 25 : 10 : 4
2. 9 : 6 : 4
3. 16 : 4 : 1
4. 6 : 3 : 2

Correct answer: 9 : 6 : 4

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