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A = {1, 2, 3, 4,...}
C. 1 ∈ A
2.
K = {1, 2, 3, 4, 5}
n(K) = 5
H.B. = 2^(n)
= 2^(5)
= 32........(B)
3.
A = {k, l, m, n, o}
n(A) = 5
Segitiga pascal
1 4 10 10 5 1
1 = 0 anggta bagian
4 = 1 anggota bagian
10 = 2 anggota bagian
10 = 3 anggota bagian
5 = 4 anggota bagian.......(B)
1 = 5 anggota bagian