3 n 4 5n July 8, 2019 16 32 64 128 36 5n =- 3 n 4 N 3 3n 4 5n 6 21 3 n 4 3 5n 6 N 2 3 n 4 5n 6 21 2 1 3 3n 4 5n 18 1 1 3 3n 4 5n 15 If 2n 3 3n 4 5n 1 are in ap 2n 3 n 4 )+ 5 5n 7 5n 3 n 4 )= 60 3 n 2 )= 2 5n 4 N 4 5n 3 6n 2 12n 3 7 n 4 )+ 5n