StudentXIIStd

Thanks for the details - the question is as in the main post. The question is from a test paper which I am trying to solve. Can you please explain your solution with some information?

I am a student of XII std and unable to get the answer for this question: A forms a CCP (cubic close packing). A atoms are in the corners, B atoms are at the alternate face what is the formula of the compound? My understanding is that A atoms : 8 x 1/8 = 1 B atoms = 3 x 1/2 = 3/2 Formula of compound = A2B3 OR A atoms : 8 x 1/8 = 1 B atoms = 6 x 1/2 = 3 Formula of compound = AB3 Is my understanding correct or which is the correct formula for the compound?