In the following list of letters,how many O's | vedclass

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(C) We need to find the pattern $X O Q$,where $X 
eq D$.Let us analyze the sequence:$D, O, Q, O, D, Q, O, D, O, D, Q, D, O, Q, D, S, D, Q, P, O, Q, D

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$2$

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(C) We need to find the pattern $X O Q$,where $X 
eq D$.Let us analyze the sequence:$D, O, Q, O, D, Q, O, D, O, D, Q, D, O, Q, D, S, D, Q, P, O, Q, D, S, S, S, D, O, Q, O, Q, D, O, Q, D, D, O, Q$$1$. The first $O$ is preceded by $D$ $(D O Q)$. (Invalid)$2$. The second $O$ is preceded by $Q$ $(Q O D)$. (Invalid)$3$. The third $O$ is preceded by $Q$ $(Q O D)$. (Invalid)$4$. The fourth $O$ is preceded by $D$ $(D O D)$. (Invalid)$5$. The fifth $O$ is preceded by $D$ $(D O Q)$. (Invalid)$6$. The sixth $O$ is preceded by $S$ $(S O Q)$. (Valid: $O$ is followed by $Q$ and not preceded by $D$)$7$. The seventh $O$ is preceded by $Q$ $(Q O Q)$. (Valid: $O$ is followed by $Q$ and not preceded by $D$)$8$. The eighth $O$ is preceded by $D$ $(D O Q)$. (Invalid)$9$. The ninth $O$ is preceded by $D$ $(D O Q)$. (Invalid)There are $2$ such occurrences.

In the following list of letters,how many $O$'s are followed by $Q$'s but not preceded by $D$'s?
$D, O, Q, O, D, Q, O, D, O, D, Q, D, O, Q, D, S, D, Q, P$
$O, Q, D, S, S, S, D, O, Q, O, Q, D, O, Q, D, D, O, Q$

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In the following list of letters,how many $O$'s are followed by $Q$'s but not preceded by $D$'s?$D, O, Q, O, D, Q, O, D, O, D, Q, D, O, Q, D, S, D, Q, P$$O, Q, D, S, S, S, D, O, Q, O, Q, D, O, Q, D, D, O, Q$