chance operations

Hi all,
I always wondered what chance operations were for Cage exactly, 
especially in regards of his usage of the I-Ching.
Sometimes he used it as a random number generator, which initially 
probably meant tossing the coins to obtain an hexagram, that is, a 
number between 1 and 64.
Later, he used a computer generated outcome to determine such random 
number, which made his job faster.
However, this implies that his questions were supposed to receive a 
numerical answer, a number, limiting the range of possible questions. Is 
that so?
And finally, has Cage ever interpreted the I-Ching hexagram meaning for 
his works? Not just numerically I mean. If so, it would be really 
interesting to see what kind of questions he posed.

Thanks in advance for your help,
Stefano