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If a1, a2, a3, . . . , an, . . . is a sequence such that

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If a1, a2, a3, . . . , an, . . . is a sequence such that [#permalink] New post 02 Aug 2007, 18:23
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17. If a1, a2, a3, . . . , an, . . . is a sequence such that an=2n for all n ≥ 1, is ai greater than aj ?

(1) i is odd and j is even
(2) i2 > j2

anyone get this

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Re: DS question [#permalink] New post 02 Aug 2007, 18:52
dragonball20cal wrote:
17. If a1, a2, a3, . . . , an, . . . is a sequence such that an=2n for all n ≥ 1, is ai greater than aj ?

(1) i is odd and j is even
(2) i2 > j2


E. since we do not know whether i and j both are +ve or -ve.
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 [#permalink] New post 02 Aug 2007, 19:30
St1:
i could be 5, then a5 = 10, j could be 8, then a8 = 16 and ai <aj> aj.

As long as the stement doesn't tells us if ai came first or aj came first, then we can't tell their relationship.

St2:
The statement tells us n >= 1. So i and j must be positive. In this case, i must be always greater than j and ai > aj.

Sufficient.

Ans B
  [#permalink] 02 Aug 2007, 19:30
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