In the following list of numerals,how many 2' | vedclass

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(C) We need to find the pattern $(X, 2, 1)$ where $X 
eq 4$.Given sequence: $4, 2, 1, 2, 1, 4, 2, 1, 1, 2, 4, 4, 4, 1, 2, 2, 1, 2, 1, 4, 4, 2, 1, 4,

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Four

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(C) We need to find the pattern $(X, 2, 1)$ where $X 
eq 4$.Given sequence: $4, 2, 1, 2, 1, 4, 2, 1, 1, 2, 4, 4, 4, 1, 2, 2, 1, 2, 1, 4, 4, 2, 1, 4, 2, 1, 2, 1, 2, 4, 1, 4, 2, 1, 2, 4, 1, 4, 6$.Let's identify all occurrences of $2$ followed by $1$:$1$. $(4, 2, 1)$ - Preceded by $4$ (Exclude)$2$. $(2, 2, 1)$ - Preceded by $2$ (Include)$3$. $(1, 2, 1)$ - Preceded by $1$ (Include)$4$. $(4, 2, 1)$ - Preceded by $4$ (Exclude)$5$. $(4, 2, 1)$ - Preceded by $4$ (Exclude)$6$. $(2, 2, 1)$ - Preceded by $2$ (Include)$7$. $(2, 2, 1)$ - Preceded by $2$ (Include)$8$. $(4, 2, 1)$ - Preceded by $4$ (Exclude)Counting the valid occurrences: $2, 3, 6, 7$ correspond to the pattern $(X, 2, 1)$ where $X 
eq 4$.There are $4$ such occurrences.

In the following list of numerals,how many $2$'s are followed by $1$'s but not preceded by $4$?

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