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# In a sequence of number, if the first number is positive

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Manager
Joined: 16 May 2004
Posts: 118
Location: Thailand
In a sequence of number, if the first number is positive [#permalink]

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22 May 2004, 07:19
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In a sequence of number, if the first number is positive interger and if each number thereafter is the least prime number greater than the preceding number, what is the value of the fifth number in the sequence?

(1) The sum of the first two number in the sequence is equal to the third number in the sequence.
(2) The sum of the third and fourth number in the sequence is 8.
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Manager
Joined: 10 Mar 2004
Posts: 64
Location: Dallas,TX

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22 May 2004, 21:58
hallelujah1234 wrote:
1+2 = 3

D it is

For (1), the series can be 2+3 = 5 also.

So, 1 is not sufficient. I will go with (b)
SVP
Joined: 30 Oct 2003
Posts: 1790
Location: NewJersey USA

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23 May 2004, 10:04
I concur with virtual

A) I am not sure if 1 is a prime number ( can anyone confirm this ? )
1,2,3,5,7.....
2,3,5,7....

B) 1,2,3,5....
Manager
Joined: 10 Mar 2004
Posts: 64
Location: Dallas,TX

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23 May 2004, 10:27
anandnk wrote:
I concur with virtual

A) I am not sure if 1 is a prime number ( can anyone confirm this ? )
1,2,3,5,7.....
2,3,5,7....

B) 1,2,3,5....

1 is not a prime number.

Question does not state that the first digit is a prime no. so (2) still holds good.
Manager
Joined: 16 May 2004
Posts: 118
Location: Thailand

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23 May 2004, 18:51
From the question itself, there are many possible answers such as
1 2 3 5 7 11
2 3 5 7 11 13
3 5 7 11 13 17
5 7 11 13 17 19

When we take (1) into consideration, only the 1st series is correct " 1 2 3 5 7"

When we consider (2), we get the same series of " 1 2 3 5 7"

So..D is absolutely correct

Congratulation!
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Manager
Joined: 16 May 2004
Posts: 118
Location: Thailand

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23 May 2004, 18:56
Opps...sorry..it's my mistake for (1). It can be 2 3 5 7 also...So VIRTUAL is absolutely right sorry sorry again for my confusion
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23 May 2004, 18:56
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