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Let f(x) and g(x) be bijective functions...

Let f(x) and g(x) be bijective functions where `f:{a,b,c,d} to {1,2,3,4} " and " g :{3,4,5,6} to {w,x,y,z},` respectively. Then, find the number of elements in the range set of `g(f(x)).`

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The range of `f(x)` for which `g(f(x))` is defined is `{3,4}`.
Hence, the domain of `g{f(x)}` has two elements.
Therefore, the range of `g(f(x))` also has two elements.
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