ps - finite sequence : PS Archive
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# ps - finite sequence

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07 Aug 2005, 11:00
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for a finite sequence of nonzero numbers, the number of variations in sign is defined as the number of pairs of consecutive terms of the sequence for which the product of the two consecutive terms is negative. what is the number of variations in sign for the sequence 1, -3, 2, 5, -4, -6 ?

one

two

three

four

five

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07 Aug 2005, 20:44
the question seem to define the variation of sign as
each time the + turned into - or vice versa

if so, I would go with 'three'
07 Aug 2005, 20:44
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