no of isomers?

there are
1) 16 pairs of 32 stereo isomers in aldoheptoses
2) 8 pairs of 16 stereo isomers in ketoheptoses

i havenot studied "biomolecules" till now.....so i cannot help !!!! .....biomolecule is as idiotic a chapter as is the whole of biology

@champ

first of all how did u get those figures bro??

the answer is given as 1/2. How do u justify that with ur answer??