If
A is a
set with 5 elements, how many are the
subsets of
A ?
If A contains k elements, so there are 2k subsets of A.
Solution:
n(A) = 5 ⇒ n[P(A)] = 2
5 = 32.
Obs.: n[P(A)] means number of parts of A or number of subsets of A.