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F= {x|x=2k, k € N, x <13}

Răspuns :

x=2k=2×k
k=1,2,3,4,5,6
x=2×1=2
x=2×2=4
x=2×3=6
x=2×4=8
x=2×5=10
x=2×6=12
x∈ {2,4,6,8,10,12}

k∈{0, 1, 2, ...6} F={0, 2, 4, 6, 8, 10, 12}