if f(g(x)) is one-one function, then (1)...

if `f(g(x))` is one-one function, then (1) g(x) must be one- one (2) f(x) must be one - one (3) f(x) may not be one-one (4) g(x) may not be one-one

g(x) must be one-one

f(x) must be one-one

f(x) may not be one-one

g(x) may not be one-one

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A, C

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