We know that is flipped to give
and so gives the same results as
Recording is (-4) x 5 x 6 = (-120) = -120
Generally flipping a holder anywhere in a chain of holders will flip the card held at the top.
Two flips will return the card to its original position.
So gives the same result as
Recording (-6) x (-3) x 7 = 126
When there are negative holders look to see if they can be paired.
When all negative holders can be put into groups of two leave the card alone.
When there is one negative holder that cannot be put in a group of two flip the card.
In both cases flip all negative holders.
|Both these chains of holders have negative holders that can be grouped into twos.|
Recording (-7) x 6 x 9 x (-2) = 252 and
(-8) x (-3) x (-5) x (-4) x (-5) = (-2400) = -2400
|Both these chains of holders have a negative holder that cannot be paired with another.|
In these cases flip the cards as well as all negative holders
Recording (-9) x 7 x 3 x 2 = (-278) = -278 and
(-3) x (-7) x 4 x (-6) x (-8) = 4032