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Que. Let f be a function from a set A to a set B, g a function from B to C, and h a function from A to C, such that h(a) = g(f(a)) for all a ∈ A. Which of the following statements is always true for all such functions f and g?  
a. g is onto => h is onto
b. h is onto => f is onto
c. h is onto => g is onto
d. h is onto => f and g are onto
Answer:h is onto => g is onto
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