Funny Hand

CodeChefRating 1306Open on judge ↗

MoEngage has $3$ decks. Each deck consists of $N$ cards, numbered from $1$ to $N$. He draws out $1$ card from each deck randomly with each card having an equal probability of being drawn. MoEngage drew cards numbered $A$ and $B$ from the decks $1$ and $2$ respectively. Now, he wonders what is the probability that he will end up with a *funny hand* after drawing the third card. A *funny hand* is

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solution.cppC++17

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