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

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Manager
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Joined: 25 Apr 2007
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If a1, a2, a3, . . . , an, . . . is a sequence such that [#permalink] New post 01 Nov 2007, 15:52
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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) i^2 > j^2

Please explain your answers.
Director
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Re: DS - Sequence [#permalink] New post 01 Nov 2007, 23:00
2,4,6,8,10,.......

2 <4> 4 ( i= 3, j= 2)

(i) is insufficient.


from(ii)

we know cases like i=3 and j=2 are possible. ( ai > aj)

but cases like i=4 and j= 5 are not ( ai <aj> aj

thus answer should be C.
Re: DS - Sequence   [#permalink] 01 Nov 2007, 23:00
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If a1, a2, a3, . . . , an, . . . is a sequence such that

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