A bowl of berries contains 2 strawberries, 4 blackberries, 1 raspberry, and 3 blueberries Loue will randomly select two berries
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Recall that
Take it one piece at a time. For
If we shift the argument by 1 and scale by -5, we have
so if we subtract this from
For the next piece, we can add another scaled and shifted step like
so that
For the last piece, we add one more term:
and so putting everything together, we get