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A sequence contains the terms 1,3, 5, 7, 9, where the nth term

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Carcass
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A sequence contains the terms 1,3, 5, 7, 9, where the nth term [#permalink] New post   13 May 2024, 23:53
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A sequence contains the terms 1,–3, 5, –7, 9……………, where the \(n^{th}\) term is given as \([(-1)^{(n-1)}](2n-1)\).


Quantity A
Quantity B
Sum of the first 25 terms of the given series
50




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B
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steveharvi
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Re: A sequence contains the terms 1,3, 5, 7, 9, where the nth term [#permalink] New post   28 May 2024, 08:01
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we can divide the sequence into 2 halves, 1,5,9,13...till 49 (13 terms) and then -3,-7,-11,-15,-19...(12 terms), adding these 2, the result would be 38 (338-300), meaning b>a. Let me know if this approach is correct.., thanks in advance
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Re: A sequence contains the terms 1,3, 5, 7, 9, where the nth term [#permalink] New post   28 May 2024, 10:45
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It works like a charm :thumbsup:
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A sequence contains the terms 1,3, 5, 7, 9, where the nth term [#permalink] New post   04 Jun 2024, 05:21
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1,-3,5,-7,9........n

as per the function 25th term = 49

1,-3,5,-7,9........49 and 49 is 25th term, an odd term.
the seq is nothing but list of odd numbers with negative at even places. since 49 is 25th term it will be positive
1,-3, 5,-7 , 9........49 on pairing each it gives -2

-2x(24/2) = -24

-24+49=25 < 50 hence B
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Re: A sequence contains the terms 1,3, 5, 7, 9, where the nth term [#permalink] New post   28 Nov 2024, 12:20
Carcass, can you please share a link to problems of the same type?
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A sequence contains the terms 1,3, 5, 7, 9, where the nth term [#permalink] New post   28 Nov 2024, 14:07
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Sure . Happy to do. However, it is quite simple to you to find out. The forum is structured in a way to find similar questions, easily. This is possible in several way

1) If you take a look at the very bottom of this discussion you are able to see a frame with the link to similar questions


Attachment:
screenshot.2709.jpg
screenshot.2709.jpg [ 159.88 KiB | Viewed 1282 times ]


This is valid for EVERY single discussion/topic/questions on the forum both quant and verbal

2) Go under each sub section of the forum, namely, QCQ, PS, NE, TC,SE,RC,CR and you will have on top the filter

Attachment:
screenshot.2708.jpg
screenshot.2708.jpg [ 27.18 KiB | Viewed 1282 times ]


This way you are able to find the questions you are looking for

3) Use our directories topic wise

GRE PREMIUM Quant Question Banks - Topic-Wise Sequences And Series https://gre.myprepclub.com/forum/gre-pr ... ml#p116070

GRE - Quant Daily Topic-wise Challenge - SEQUENCE AND SERIES https://gre.myprepclub.com/forum/gre-qu ... ml#p106602

Others sequence and series questions to practice

QCQ - https://gre.myprepclub.com/forum/quanti ... s%5B%5D=35
PS - https://gre.myprepclub.com/forum/multip ... %5B%5D=536
MAC - https://gre.myprepclub.com/forum/multip ... %5B%5D=539
NE - https://gre.myprepclub.com/forum/numeri ... %5B%5D=502
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A sequence contains the terms 1,3, 5, 7, 9, where the nth term [#permalink]
28 Nov 2024, 14:07
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