Why Rudraksha or Tulsi or Rosary chains used to recite prayers contain 108 beads

There are 9 planets & 12 houses in a horoscope chart. 9 multiplied by 12 makes 108. Thus to make all the houses of a horoscope chart strong & nullify negative effects of any planet Rudraksha or Tulsi or Rosary chains contain 108 beads to recite prayers.