MathematicsEasy64×since 2002Q2975If the number of terms in the expansion of (1−2x+4x2)n, x≠0,{\left( {1 - {2 \over x} + {4 \over {{x^2}}}} \right)^n},\,x \ne 0,(1−x2+x24)n,x=0, is 28, then the sum of the coefficients of all the terms in this expansion, is :A243B729C64D2187Check answerSkip