Question

Which ancient book contains 64 hexagrams

Answer 1

The I Ching (/ˈiː ˈdʒɪŋ/),[2] also known as Classic of Changes or Book of Changes, is an ancient Chinese divination text and the oldest of the Chinese classics. Possessing a history of more than two and a half millennia of commentary and interpretation, the I Ching is an influential text read throughout the world, providing inspiration to the worlds of religion, psychoanalysis, business, literature, and art.

Answer 2

Your answer is I Ching.