Question

हाउ टू नो द कंपाउंड इज मेड अप ऑफ व्हिच एलिमेंट​

Answer 1

No. of atoms of A at the corners=7 (because one A is missing)

∴ Contribution atoms of A towards unit cell =7×18=78

No. of atoms B at face-centres=6 ∴ Contribution of atom B towards unit cell=6×12=3

Ratio of A:B=78:3=7:24 ∴ Formula is A7B24