Let a, b, c > 1, a3 , b3 and c3 be in A.P., and logab, logca and logbc be in G.P. If the sum of first 20 terms of an A.P., whose first term is a + 4 b + c a+4b+c/3and the common difference 8-8b+c/10 is – 444, then abc is equal to
(1) 343
(2) 216
(3) 343/8
(4) 125/8