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Let a , b , c > 1 a 3 , b 3 and c 3 be in A.P ., and log a b , log c a and log b c be in G.P. If the sum of first 20 terms of an A.P., whose first term is 3 c b 4 a   and the common difference is 10 c b 8 a   is – 444, then abc is equal to:

1. 8 343
2. 8 125
3. 343
4. 216

Correct answer: 216

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