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For a list of positive integers, from the third terms, each [#permalink]
07 Aug 2006, 16:44

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For a list of positive integers, from the third terms, each term is the sum of two previous terms, if the sum is odd; otherwise, the term is half of the sum. If fourth term is 7, and fifth term is 5, what is the first term?

z must be 3 or -2. can not be -2. So z = 3
Now xy375
y must be 4 or 11.
When x4375:
x must be 2 or -1. Can not be -1. So its 2. When x,11,375:
x must be -8 or -5. Both are -ve so not possible.