MathematicsHard244×since 2002Q4489Let A = \left[ {\matrix{ 1 & 0 & 0 \cr 1 & 1 & 0 \cr 1 & 1 & 1 \cr } } \right] and B = A²⁰. Then the sum of the elements of the first column of B is :A210B211C231D251Check answerSkip