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f is strictly increasing on I if x1 < x2 in I always implies
Af(x1) ≥ f(x2)
Bf(x1) < f(x2)
Cf(x1) > f(x2)
Df(x1) = f(x2)
Answer & Solution
Correct answer: B. f(x1) < f(x2)
Strict increase means a larger input always gives a strictly larger output.
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