4 2 3n 10 July 8, 2019 16 32 64 128 N 4 3n 2 10n 10 2 3n 7 )= 4 10.5 5n 10 2 3n 4 5n 6 21 2 3n 2 10n )+ 4 4 2 3 1 pes
