How many 4-letter code words can be made using the letters in the word pencil if : (a) Repetitions are permitted?
2 answers:
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In short, (h o g)(a) is just h( g(a) ).
so what we can do is simply get g(a) first and then plug that in h(x).
so what we can do is simply get g(a) first and then plug that in h(x).