WE_DEFINE_Y[N]_=_NX[N]_‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ¬®_(N-1)X[N]._NOW,_Z[N]_=_Z[N-1]_+_Y[N],_IS_Z[N]_STABLE??$#

• A. Yes
• B. No