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For a list of +ve integers , from the third terms, each term

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For a list of +ve integers , from the third terms, each term [#permalink] New post 27 Jul 2007, 19:46
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For a list of +ve integers , from the third terms, each term is the sum of the two previous term if the sum is odd;otherwise , the term is half the sum.If the fourth term is 7 abd the fifth term is 5, what is the first number?


Please explain
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 [#permalink] New post 27 Jul 2007, 20:48
Himalayan

Could you please explain your approch?
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 [#permalink] New post 27 Jul 2007, 20:51
humtum0 wrote:
Himalayan

Could you please explain your approch?


5th term = 10 cuz 5 is smallar than 7 so it must be half of its double i.e. 10.

similarly:

3rd term = 2
2nd term = 4
1st term 2.

just plug back from 5th term.
  [#permalink] 27 Jul 2007, 20:51
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For a list of +ve integers , from the third terms, each term

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