Count each 1 in the following sequence of num | vedclass

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(B) We need to find the number of $1$'s that are followed by $2$,provided that the $2$ is not followed by $3$. The condition is $(1, 2, 	ext{not } 3)

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$4$

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(B) We need to find the number of $1$'s that are followed by $2$,provided that the $2$ is not followed by $3$. The condition is $(1, 2, 	ext{not } 3)$.Let's analyze the sequence: $1, 2, 1, 3, 4, 5, 1, 2, 3, 5, 2, 1, 2, 6, 1, 4, 5, 1, 1, 2, 4, 1, 2, 3, 2, 1, 7, 5, 2, 1, 2, 5$.$1$. The first $1$ is followed by $2$,and $2$ is followed by $1$ (not $3$). This is a valid pair: $(1, 2, 1)$.$2$. The next $1$ is followed by $3$ (invalid).$3$. The next $1$ is followed by $2$,and $2$ is followed by $3$ (invalid).$4$. The next $1$ is followed by $2$,and $2$ is followed by $6$ (not $3$). This is a valid pair: $(1, 2, 6)$.$5$. The next $1$ is followed by $4$ (invalid).$6$. The next $1$ is followed by $1$ (invalid).$7$. The next $1$ is followed by $2$,and $2$ is followed by $4$ (not $3$). This is a valid pair: $(1, 2, 4)$.$8$. The next $1$ is followed by $2$,and $2$ is followed by $3$ (invalid).$9$. The next $1$ is followed by $7$ (invalid).$10$. The next $1$ is followed by $2$,and $2$ is followed by $5$ (not $3$). This is a valid pair: $(1, 2, 5)$.Counting the valid occurrences,we have $4$ such $1$'s.

Count each $1$ in the following sequence of numbers that is immediately followed by $2$,if $2$ is not immediately followed by $3$. How many such $1$'s are there?
$1, 2, 1, 3, 4, 5, 1, 2, 3, 5, 2, 1, 2, 6, 1, 4, 5, 1, 1, 2, 4, 1, 2, 3, 2, 1, 7, 5, 2, 1, 2, 5$

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Count each $1$ in the following sequence of numbers that is immediately followed by $2$,if $2$ is not immediately followed by $3$. How many such $1$'s are there?$1, 2, 1, 3, 4, 5, 1, 2, 3, 5, 2, 1, 2, 6, 1, 4, 5, 1, 1, 2, 4, 1, 2, 3, 2, 1, 7, 5, 2, 1, 2, 5$