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Verified answer
X = {3 , 5 , 7 , 11 , 13}f(x) = 2x - 7
f(3) = 2(3) - 7
f(3) = 6 - 7
f(3) = -1
f(5) = 2(5) - 7
f(5) = 10 - 7
f(5) = 3
f(7) = 2(7) - 7
f(7) = 14 - 7
f(7) = 7
f(11) = 2(11) - 7
f(11) = 22 - 7
f(11) = 15
f(13) = 2(13) - 7
f(13) = 26 - 7
f(13) = 19
Jadi daerah hasilnya adalah {-1 , 3 , 7 , 15 , 19} (B)