N 2 10 9 July 8, 2019 16 32 64 128 N 2 9n 10 N 2 9n 10 0 5 n 2 )= 10 3n 9 2 10 n 90 2 10 n 90 artinya 9 36 2 n 10 51 53 w 10 n 2-9n+2=0 N2 = −18 − 9n N × 2