Question

The total number of non- empty subsets of a finite set. containing n elements is ....................​

Answer 1

Answer:

Number of proper subsets of a set containing n elements is 2

n

−1

So, a set containing 7 elements will have 2

7

−1=128−1=127 proper subsets

But one of these proper subsets is a null set.

Hence, number of non zero proper subsets will be 127−1=126

Answer 2

Answer:

Animals which live in the forest help it grow and regenerate in following ways:

By eating vegetation they clear land for fresh growth

Animals help flowering plants in pollination and seed dispersal

Dead remains of animals make humus after decomposition. This increases soil fertility