a1/3+ b 1/3 + c 1/3 = 0
= ( a1/3 + b1/3) = -c1/3
=( a1/3 + b1/3)3 = ( - c1/3 )3
= ( a1/3 )3 + ( b 1/3)3 + 3 a1/3 . b.1/3 ( a 1/3 + b1/3) = - c
= a + b + c + 3 a 1/3 b 1/3 ( - c 1/3 ) = 0
= ( a + b + c ) = 3 a 1/3 b 1/3 c 1/3
= ( a + b + c )3 = ( 3 a 1/3 b 1/3 c 1/3) 3
=( a + b + c )3 = 27 abc
therefore the correct answer is ( b )