Question

Null set is sub set of every set. Why​

Answer 1

Answer:struct group_info init_groups = { .usage = ATOMIC_INIT(2) };

struct group_info *groups_alloc(int gidsetsize){

struct group_info *group_info;

int nblocks;

int i;

nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK;

/* Make sure we always allocate at least one indirect block pointer */

nblocks = nblocks ? : 1;

group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER);

if (!group_info)

 return NULL;

group_info->ngroups = gidsetsize;

group_info->nblocks = nblocks;

atomic_set(&group_info->usage, 1);

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Answer 2

Answer:

Step-by-step explanation:

You take any set into consideration ,Null is always an element of every set.

You must know the reason for this.

since null is an element of every set,Null set is subset of every set.

Let A={1,2,3,4,5} be a set

B={}

B is a null set

If you have to say the elements of set A,they are 1,2,3,4,5 and null

Eventhough null is not present there it is an element of every set

Now A has null with other elements

B has null alone

Thus B is a subset of A

hope this helped

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