suku ke 10 dari barisan bilangan 15, 24 , 35 , 48,63

= 24 - 15 = 9 , 35-24 = 11, 48 - 35 = 13, 63 - 48 = 15
rasio = 9,11,13,15,17,19,21,23,25,27,29
= rasio suku 10 = 29 x 10 = 290
= suku 10 = (290-1) - 15 = 274