I can take that Q for Amar:

That means no matter how big/small table you create, Oracle creates in multiple of distinct extent sizes mentioned(64K,1M,8M,64M).

In practical terms:

If you create 512K table in LMT with AUTOALLOCATE it uses 64K

If you use 10M , it uses IM extent size and if you use 50M, it uses 8M size and so on.

In first case 8 extents, second case 10 extents, third case 7 extents as opposed to
6+partial extent for 2MB.