sequence!

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marmar29: Senior | Next Rank: 100 Posts; Posts: 61; Joined: Mon Feb 14, 2011 11:39 pm

sequence!

by marmar29 » Tue Aug 23, 2011 12:02 am

1,3,11,123,....

a- 15129
b- 15130
c- 15131
d- 15132
e- 15133
just checking is it c ?
am i right

2,6,14 ,......
a)10
b)20
c)30
d)40
e)50
also i answered it c ..am i right ??

4,9,24 , ......
a- 67
b- 68
c- 69
d- 70
e - 71
is it c ??

thankz aloot folks:)
thanks aloot folks!

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Source: Beat The GMAT — Problem Solving | Tue Aug 23, 2011 12:02 am

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pm; Location: Milpitas, CA; Thanked: 1854 times; Followed by:523 members; GMAT Score:770

by Anurag@Gurome » Tue Aug 23, 2011 12:49 am

marmar29 wrote:1,3,11,123,....

3 = 1^2 + 2
11 = 3^2 + 2
123 = 11^2 + 2

Hence, the next term will be (123^2 + 2) = 15131

The best answer is C.

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GMAT/MBA Expert

Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pm; Location: Milpitas, CA; Thanked: 1854 times; Followed by:523 members; GMAT Score:770

by Anurag@Gurome » Tue Aug 23, 2011 12:51 am

marmar29 wrote:2,6,14 ,......

6 = 2*2 + 2
14 = 2*6 + 2

So the next term can be (2*14 + 2) = 30

The best answer is C.

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GMAT/MBA Expert

Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pm; Location: Milpitas, CA; Thanked: 1854 times; Followed by:523 members; GMAT Score:770