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

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Manager
Joined: 16 May 2004
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In a sequence of number, if the first number is positive [#permalink]  22 May 2004, 06:19
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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
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[#permalink]  22 May 2004, 20:58
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
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[#permalink]  23 May 2004, 09:04
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
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[#permalink]  23 May 2004, 09:27
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
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[#permalink]  23 May 2004, 17:51
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
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[#permalink]  23 May 2004, 17:56
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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[#permalink] 23 May 2004, 17:56
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# In a sequence of number, if the first number is positive

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