How many 7s are there in the following series | vedclass

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(B) To find the number of $7$s that are immediately preceded by $6$ and not immediately followed by $4$,we examine the series:$7, 4, 2, 7, 8, 4, 3, 6,

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$2$

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(B) To find the number of $7$s that are immediately preceded by $6$ and not immediately followed by $4$,we examine the series:$7, 4, 2, 7, 8, 4, 3, 6, 7, 5, 3, 5, 7, 8, 4, 3, 7, 6, 7, 2, 4, 0, 6, 7, 4, 3$$1$. Identify all $7$s in the series.$2$. Check the digit before each $7$ to see if it is $6$.$3$. Check the digit after each $7$ to see if it is $NOT$ $4$.- The first $7$ preceded by $6$ is at the $9$th position: $6, 7, 5$. Here,$7$ is preceded by $6$ and followed by $5$ (not $4$). This satisfies the condition.- The second $7$ preceded by $6$ is at the $19$th position: $6, 7, 2$. Here,$7$ is preceded by $6$ and followed by $2$ (not $4$). This satisfies the condition.- The third $7$ preceded by $6$ is at the $24$th position: $6, 7, 4$. Here,$7$ is preceded by $6$ but followed by $4$. 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 immediately preceded by $6$ but not immediately followed by $4$?
$7, 4, 2, 7, 8, 4, 3, 6, 7, 5, 3, 5, 7, 8, 4, 3, 7, 6, 7, 2, 4, 0, 6, 7, 4, 3$

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How many $7$s are there in the following series which are immediately preceded by $6$ but not immediately followed by $4$?$7, 4, 2, 7, 8, 4, 3, 6, 7, 5, 3, 5, 7, 8, 4, 3, 7, 6, 7, 2, 4, 0, 6, 7, 4, 3$