Question

How many distinct derivations of bcde are possible using

S \rightarrow BCDE

B\rightarrow b

C \rightarrow c

D \rightarrow d

E \rightarrow e

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Answer #1

bcde can be derived by replacing the value of 'b', 'c', 'd' and 'e' into B, C,D and E, respectively.

The number of derivations depend on the order in which we substitute the values.

Number of distinct derivations = 4! = 24

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