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f(4) = 16 - 1 = 15
f(6) - f(4) = 35 - 15 = 20 (A)
f(6) = 6²-1
= 36-1
= 35
f(4) = 4²-1
= 16-1
= 15
Jadi f(6) - f(4) = 35 - 15 = 20