How many 7's are there in the following serie | vedclass

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(B) We need to find the number of $7$'s that satisfy two conditions:$1$. Preceded by $8$ (i.e.,the pattern $8, 7$).$2$. Not followed by $3$ (i.e.,the

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$2$

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(B) We need to find the number of $7$'s that satisfy two conditions:$1$. Preceded by $8$ (i.e.,the pattern $8, 7$).$2$. Not followed by $3$ (i.e.,the pattern $8, 7, x$ where $x 
eq 3$).Let's analyze the series: $8, 9, 8, 7, 6, 2, 2, 6, 3, 2, 6, 9, 7, 3, 2, 8, 7, 2, 7, 7, 8, 7, 3, 7, 7, 9, 4$Identify all $7$'s preceded by $8$:- The first $7$ is preceded by $8$ $(8, 7, 6)$. Here,$7$ is followed by $6$ (not $3$). This satisfies the condition.- The second $7$ is preceded by $8$ $(8, 7, 2)$. Here,$7$ is followed by $2$ (not $3$). This satisfies the condition.- The third $7$ is preceded by $8$ $(8, 7, 3)$. Here,$7$ is followed by $3$. This does not satisfy the condition.Thus,there are $2$ such $7$'s.

How many $7$'s are there in the following series which are not immediately followed by $3$ but immediately preceded by $8$?
$8, 9, 8, 7, 6, 2, 2, 6, 3, 2, 6, 9, 7, 3, 2, 8, 7, 2, 7, 7, 8, 7, 3, 7, 7, 9, 4$

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How many $7$'s are there in the following series which are not immediately followed by $3$ but immediately preceded by $8$?$8, 9, 8, 7, 6, 2, 2, 6, 3, 2, 6, 9, 7, 3, 2, 8, 7, 2, 7, 7, 8, 7, 3, 7, 7, 9, 4$