Question

1. The number of elements in the power set of the set
{2, 3, 4} is​

Answer 1

Answer:

Step-by-step explanation:The power set of a set A, is the set which includes every subset of A. We denote this as P(A).

P(A) = { S | S⊆A }

So, P({1,2,{3,4},5}) = {∅,{1},{2},{{3,4}},{5},{1,2},{1,{3,4}},{1,5},{2,{3,4}},{2,5},{{3,4},{5}},{1,2,{3,4}},{1,2,5},{2,{3,4},5},{1,{3,4},{5}},{1,2,{3,4},5}}

The huge set above has the property that every element of it, is a subset of {1,2,{3,4},5}.

Answer 2

Step-by-step explanation:

2)-- helium

3)-- lithium

4)-- beryllium